Edu Cat e v5e Af v5r15 Lesson3 Toprint

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CATIA V5 Expert Mechanical Designer - Lesson 3 - Surface Design

Copyright DASSAULT SYSTEMES ��

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Surface Design

In this lesson, you will be introduced to functionality available in the Generative Surface Design workbench.

Lesson content:

Case Study: Surface DesignDesign IntentStages in the ProcessAccess the Generative Surface Design WorkbenchCreate Wireframe GeometryCreate Surface GeometryPerform OperationsSolidify the Model

Duration: Approximately 6 hours

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Case Study: Surface DesignCop

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Case Study: Surface Design

The case study for this lesson is a computer mouse, as shown below. The focus of this case study is the creation of wireframe, surface and solid features features that incorporate the design intent for the part.

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Design Intent

The model of the computer mouse must meet the following design intent requirements:

� Model contours are likely to change.

• This model is created from point data, so the geometry can quickly be changed simply by adjusting point locations.

� Wireframe, surface, and solid geometry must be kept separate.

• By creating separate Geometrical Sets for both the wireframe and surface geometry, the model can be kept organized to help others users quickly identify the different elements making up the model.

� Buttons must be built as a separate body but update when changes are made to the main body.

• The button geometry can be create in a separate body while still using surfaces from the main body as its limiting elements.

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Stages in the Process

Use the following steps to create the model of the computer mouse:

1. Access the Generative Surface Design workbench.

2. Create the wireframe geometry. 3. Create the surface geometry.4. Perform operations.5. Solidify the model.

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Step 1 - Access the Generative Surface Design WorkbenchCop

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Surface Design

Step 1: Access the Generative Surface Design workbench.In this section, you will learn how to access the Generative Surface Design workbench and become familiar with its tools, terminology, and the general process involved in created a model using surfaces.



2. Create the wireframe geometry.3. Create the surface geometry.4. Perform operations.5. Solidify the model.

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Step 1: Access the Generative Surface Design WorkbenchCop

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Introduction to Surface Design

Wireframe and surface geometry is often needed to define models with complex shapes. Surface geometry may need to be integrated into the solid model to fully capture its design intent.

The shape design process will be discussed later, but for now it is important to consider two key points:

A. Wireframe and surface geometry is used to define complex 3D shapes.

B. Wireframe, surface, and solid geometry form an integrated set of modeling capabilities that enable you to fully capture the design intent.

Surface geometry

Wireframegeometry

Solid geometry

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The Generative Shape Design Workbench (1/3)

Ease of Use

Generative shape design is unique because it can be used by novices to surface design (due to ease of use) or by advanced shape designers who are looking for a complete surfacing tool (due to a wide functional set). The specification capture is completely transparent; it would seem as though the user was designing explicit shapes.

Generative shape design is perfect for designing surfaces of plastic parts or shells. After importing surfaces, you can check and heal them with the CATIA - Healing Assistant (HA1). You can then modify and add other surfaces using the powerful wireframe and surface creation tools of GS1. The design parts can then be manufactured after the surface machining program in the CATIA 3-Axis Machining 2 (SMG) product.

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From Preliminary to Detailed Design

CATIA - Generative Shape Design 1 provides a comprehensive set of tools for shape design. These tools give you the flexibility to make the quick changes needed in preliminary design work and the accuracy needed for the final detailed design.

Tools can be used to build:• Wireframe elements such as points,

planes, and curves.• Standard and advanced surface features

such as extrudes, revolves, sweeps, and fills.

• Transition features such as fillets, splits, trims, and extrapolates.

Added flexibility is provided by associative transformation features such as symmetry, scaling, and translation.

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Associativity

Wireframe and surface elements can be designed in the context of a part or an assembly. When designing in context, you can control the propagation of modifications. You can reuse an existing surface, and link to other models to support concurrent engineering.

Efficiency in design modification

Several Generative Shape Design features help for efficient management of design modifications. For example, a datum curve or skin used in one feature can be quickly replaced without redefining its children. A set of features can also be isolated as a single feature (with no history) to facilitate design comprehension and accelerate design changes.

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To access the Generative Surface Design Workbench, select Start > Shape > Generative Shape Design.

Accessing the Surface Design WorkbenchThe Generative Shape Design workbench is only available in P2 configuration.

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Surface Design Workbench User Interface (1/4)

The generative Shape Design workbench consists of:

A. The specification treeB. Contains of types geometric sets,

ordered geometric sets and bodies.C. Standard Tools toolbar.D. Workbench icon.E. Sketcher accessF. Shape design tools

FB

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The following is a list of tools available from the Wireframe toolbar:

SpineBB.AxisN.

SpiralAA.LineM.

HelixZ.Extrumum PolarL.

SplineY.ExtremumK.

ConicX.Point and Planes Repetition

J.

Connect CurveW.PointI.

CornerV.CurvesH.

CircleU.Circle-ConicG.

3D Curve OffsetT.Offset 2D3DF.

Parallel CurveS.IntersectionE.

Reflect LineR.Project-CombineD.

Q.

P.

O.

Planes

Lines

Points

CombineC.

ProjectionB.

PolylineA.

I

A B C D E F G H

PJKL

QR

MNO

S

T

UVWX

YZ

AA

BB

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The following is a list of tools available from the Surface toolbar:

Adaptive Sweep

O.

Swept SurfaceN.ExtrudeG.

Rough OffsetM.BlendF.

Variable OffsetL.Multi-sections Surface

E.

OffsetK.FillD.

J.

I.

H.

Sweeps

OffsetVar

Extrude-Revolution

CylinderC.

SphereB.

RevolveA.

G

A B C D E F

HIJ

NO

KLM

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The following is a list of tools available from the Operations toolbar:

H

A B C D E F

SIJK

TU

LM

P

NO

XYZ

AA

Axis To AxisAA.

AffinityZ.TrimM.

ScalingY.SplitL.

SymmetryX.DisassembleK.

RotateW.Untrim Surface or Curve

J.

TranslateV.Curve SmoothI.

Tritangent FilletU.HealingH.

Face-Face FilletT.JoinG.

Variable Radius Fillet

S.ExtrapolateF.

Edge FilletR.TransformationsE.

Shape FilletQ.FilletsD.

P.

O.

N.

Extracts

Trim-Split

Join-Healing

Multiple Edge Extract

C.

ExtractB.

BoundaryA.

G QR

WV

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Surface Design Workbench Terminology

A. A part is a combination of a PartBody and geometrical sets.

B. A PartBody contains the features used to create a solid.It can also contain surface and wireframe elements.

C. A Geometrical Set contains surface and wireframe elements. Order of creation is not taken into account.

D. An Ordered Geometric Set (OGS) contains surface and wireframe element. The elements in this body are created in a linear manner. OGS can also contain bodies.Bodies allow for the creation of solids within an OGS.

A

B

C

D

When you enter the Generative Shape Design workbench, Part Body is the default body available. If needed,Geometric Set and Ordered Geometric Set are inserted.

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Hybrid models, Geometrical Set, and Ordered Geometrical Sets

As discussed in Lesson one, there are several options available to organize a model.

When creating a hybrid model, wireframe and surface geometry, created in the Generative Shape Design workbench, are typically created directly in the body, or inside an Ordered Geometrical Set. This ensures a linear order to the features created in the model regardless of their type.

When working in non-hybrid models, wireframe and surface geometry can only be created in Geometrical and Ordered Geometrical sets. This ensures that features are organized by type (i.e., solid or wireframe and surface) but does not help to identify the order of feature creation.

Geometrical sets can also be created in a Hybrid Design.

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Surface Design Workbench General Process

Use the following general steps when creating a surface based feature:


2. Create the wireframe geometry.3. Create the surface geometry.4. Trim and join the body surfaces.5. Access the Part Design workbench.6. Create a part body.7. Modify geometry as needed.

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Step 2 - Create the Wireframe GeometryCop

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Surface Design

Step 2: Create the wireframe geometry.In this section, you will learn how to create the wireframe geometry that the model will be built upon.



2. Create the wireframe geometry.

3. Create the surface geometry.4. Perform operations.5. Solidify the model.

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What is a Local Axis?

A user-defined axis system can be used to define local coordinates. For example, it is often easier to build a point by coordinates with respect to a local axis rather than creating it in the absolute coordinates system.

Point created in the local coordinates system

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Axis System Types

The following types of local axis systems can be defined:

A. The Standard axis system is defined by a origin and three orthogonal directions.

B. The Rotation axis system is defined by an origin, three orthogonal directions, and an angle based off a selected referenced.

C. A Euler axis system uses Euler angles to define its orientation.

C

B

A

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Local Standard Axis: Creation

Use the following steps to create a local standard axis system:

1. Select the Axis System icon.2. Select the local axis origin point.3. To define an axis direction, select inside

the appropriate axis field and select an element to define direction. For example, to define the direction of the X axis, click inside in the X axis field and select the element to define the direction.

4. Select in a second axis field and define its direction. The direction of the third axis will automatically be defined based on the previous selections.

5. Select the Reverse option to reverse the axis direction, if necessary. In this example, the Y axis is reversed.

6. Select OK to create the axis.

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Local Axis: Current

By default, the last created axis system becomes the active system. The current axis system is highlighted in the specification tree, and is displayed with solid lines on the model. All other axis systems are dashed lines on the model.

To change the active axis system, right mouse click on the system to be made current and click Axis System.x object > Set as Current.

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Axis System with New Part

An axis system can automatically be generated when a new part is created. This axis system is defined at the origin of the model and uses the default reference planes for direction. To activate this option, click Tools > Options > Infrastructure > Part Infrastructure. From the Part Document tab, select the Create an Axis System when creating a new part option.

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Why Create 3D Wireframe Geometry?

In many design situations, there is a need to create geometry that is defined using the entire 3D space. This geometry is not limited to a single plane and therefore can not be defined using the Sketcher workbench. The elements, including points, lines, planes, and curves, created in 3D space are called wireframe geometry.

When creating 3D wireframe geometry, keep in mind the following key points:

A. Wireframe geometry is primarily used as construction geometry to create more complex 3D elements such as curves and surfaces.

B. Wireframe and sketch geometry can be used together to define more complex 3D elements.

C. Even though wireframe geometry is created in 3D space, a support element (plane or surface) may be required to define the geometry.

Surface geometry

Wireframe geometry

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Creating Reference Geometry (1/3)

As in the Part Design workbench, points, lines, and planes can be defined from the Wireframe toolbar. These reference elements can be used to build more complex wireframe and surface elements.

As in the Part Design workbench planes can be created using different types of references. Planes are useful when there is no existing reference plane on which to create the necessary geometry.

Point, line, and plane creation are discussed in the Fundamentals course.

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The following table is a summary of the point creation options.

Creates an element that represents the minimum or maximum radius or angle to a reference of a contour. In the example shown, the a minimum radius point is created on the arc, using the plane as the support and the sketch origin and H axis for direction.

Polar Extrumum

Creates points, edges, or faces that represent the minimum or maximum locations along a curve, surface or pad feature. In the example shown, the point represents the maximum location along the surface edge in the direction of the plane shown.

Extremum

Create multiple points along a curve, line, or edge. In the example shown, five points are created equal distance apart on a spline.

Points and PlanesRepetition

Create a point by specifying references based on the selected type.

Point

DescriptionGeometryType

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The following table is a summery of the line creation options:

Create an axis through existing circular elements.

Axis

Create a line by entering references based on the selected type. In the example shown, a line is created between two existing points.

Line


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Why Do You Need Curves?

Curves can be used as guides, limits, or references to create other geometric elements. Curves can be created from points, other curves, or surfaces:

For example,

A. A spline is a curve passing through selected points.

B. An Intersection is created by intersecting two existing elements, such as two surfaces.

B

A

You can edit any type of curve by double-clicking on its identifier in the tree or on the geometry. You will then change its specifications in the corresponding definition box.

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Creating Curves (1/3)

The following table provides a summery of the types of curves that can be created by intersecting or projecting existing elements.

Create a curve that is parallel to an existing curve at a specified offset distance.

Parallel Curve

Create a curve defined by the intersection of existing elements.

IntersectionCurve

Create a curve defined by the point locations of all surface normals at a specified angle.

Reflect LineCurve

Create a curve by projecting an existing element onto a plane or surface.

ProjectionCurve


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The following table provides a summery of the types of circles and conics that can be created in the Generate Shape Design workbench.

Create a conic curve of the type parabola, hyperbola or ellipse.

Conic

Create a curve that will connect two existing elements.

Connect Curve

Create a rounded corner of a specified radius between two elements.

Corner

Create a complete or partial circle by defining parameters such as center, radius, and tangency.

Circle


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The following table provides a summery of the types of curves that can be created in the Generate Shape Design workbench.

Create a single element consisting of multiple line segments.

Polyline

Create a spiral curve defined on a support support.

Spiral

Create a helical curve oriented by an axis.Helix

Create a curve passing through points on which you can impose tangency conditions.

Spline


The Helix curve is only available in P2 configuration.

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Exercise 3A

In this exercise, you will open an existing model and use the tools learned in this lesson to create the wireframe geometry necessary for the shell of a flashlight. To save time, simple wireframe elements have already been created for you. Detailed instruction for this exercise is provided for all new topics.

By the end of this exercise you will be able to:� Create a polyline� Create a line� Create a spline� Create a projection� Create a circle� Create a helix

20 min

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Exercise 3A (1/10)

1. Open part file.• Open Wireframe_Torch.CATPart. This part already

has some points and sketches created for you. a. Notice all the wireframe elements have

been created in a separate geometrical set.b. Ensure the Wireframe geometrical set is

active.

2. Create a polyline.• Create a polyline through four of the exiting points.

This polyline, along with a spline and a line created in the next steps is used as the profile for a revolve in a later exercise.

a. Select the Polyline icon.b. Select Point.1, Point.2, Point.3 and Point.4

in order.c. Highlight on Point.2 in the Polyline

definition panel.d. Enter a radius of [30mm].e. Select OK to complete the polyline.

2d

2c

2a

2e

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Exercise 3A (2/10)

3. Create a line.• Create a line between points.

a. Select the Line icon.b. Select Point-Point as the line type.c. Select Point.5 and Point.6d. Select OK to complete the line.

1b

3d

3b

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Exercise 3A (3/10)

4. Create a spline.• Create a spline to connect the polyline and the line.

a. Select the Spline icon.b. Select Point.4, Point.7, Point.5 in order.c. Select Line.1 to make Point.5 tangent to it.d. Ensure the arrow is pointing in the correct

direction. If it is not, click on the arrow to change its direction.

e. Select Point.4 from the Spline Definition panel.

f. Select Polyline.1 to make the spine tangent to the polyline at Point.4.

g. Select OK to create the spline.

4a 4e

4c

4f

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Exercise 3A (4/10)

5. Create a point.• Create a point by coordinates. This point is

projected onto one of the existing guide curves. a. Select the Point icon.b. Select Coordinates from the Point type pull-

down menu.c. Create the point at

• X = 130, Y = 0, Z = 0d. Select OK to complete.

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5c

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5d

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Exercise 3A (5/10)

6. Create a projection.• Project the point created in the last step onto the

guide curve. The point will be used in the creation of a circle.

a. Select the Projection icon.b. Select Along a Direction from the Projection

type pull-down menu.c. Select the point as the object to project.d. Select Second Sweep Guide curve as the

support.e. Select the XY plane as the direction.f. Select OK to complete the projection.

6a

1c

6b

6c

6d

6e

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Exercise 3A (6/10)

7. Create two points.• Create two more point by coordinates. These

points will act as end points for a circle. a. Create a point by coordinates at:

• X = 130, Y = 65, Z = -55b. Create a second point by coordinates at:

• X = 130, Y = -65, Z = -55

8. Create a circle.• Create a partial circle through the three points.

a. Select the Circle icon.b. Select Three points from the Circle type

pull-down menu.c. Select one of the end points.d. Select the projection point.e. Select the other end point.f. Set the Circle Limitation to Trimmed Circle.g. Select OK to complete.

7a

8a

7b

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Exercise 3A (7/10)

9. Create a line.• Create a line, this line is used as the axis for a helix

feature.a. Select the Line icon.b. Select Point-Direction from the Line type

pull-down.c. Right mouse click in the Point field and

select Create Point from the contextual menu.

d. Create a point by Coordinates.e. Select in the Reference Point field and

select Point.4.f. Enter the coordinates

• X = 0, Y = 0, Z = 80

g. Select OK.

9b

9c

9a

9d

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Exercise 3A (8/10)

9. Create a line (continued).h. Right mouse click in the Direction field and

click X-axis from the contextual menu.i. Select OK to create the line. The length of

the line is not important.

10. Create a point.• Create a point, this point will act as the start point

for a helix. a. Create a point by coordinates at:

• X = 120, Y = 0, Z = 75

9i

9h

10a

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Exercise 3A (9/10)

11. Create a helix.• Create a helix, this helix is used as a guide curve in

a later exercise. a. Select the Helix icon.b. Select the point created in the last step as

the starting point.c. Select the Line.2 as the axis.d. Enter [45mm] as the pitch.e. Enter [145mm] as the height.f. Enter [-45 deg] as the start angle.g. Enter [2.5 deg] as the taper angle.h. Select OK to complete.

11d

11c

11b

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11f11g

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Exercise 3A (10/10)

12. Create a sketch.• Create a sketch. This sketch will be used as a

profile for a swept surface in a later exercise. a. Create the circular sketch, as shown, using

the ZX plane as the sketch support.b. The center point of the circle should be

constrained to the helix.

13. Save a close the file.

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Exercise 3A : Recap

� Create a polyline

� Create a line

� Create a spline

� Create a point

� Create a projection

� Create a circle

� Create a helix

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Exercise 3B

In this exercise, you will open an existing model and use the tools learned in this lesson to create the wireframe geometry for a mobile phone. Two guide curves and a sketch have already been created for you. You will use points and curves to complete the wireframe geometry. Detailed instruction for this exercise is provided.

By the end of this exercise you will be able to:� Create points� Create splines� Create projections� Create circles

20 min

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Exercise 3B (1/6)

1. Open Wireframe_Phone.CATPart.• Open the existing file Wireframe_phone.CATPart.

Notice that two curves and a sketch have already been created for you.

a. Ensure the Wireframe geometrical set is active.

2. Create points.• Create points. These points are used to construct a

spline.a. Double-click on the Point icon to create

multiple points.b. Select Coordinates from the Point type pull-

down menu.c. Enter the following coordinates:

� X = 0mm, Y = 0mm, Z = 9mmd. Select OK to create the point. The points

dialog box remains open.2d

1

2b

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Exercise 3B (2/6)

2. Create points (continued).e. Create four more points using the

following coordinates:� Point 2:

X = 40mm, Y = 0mm, Z = 7.5mm� Point 3:

X = 60mm, Y = 0mm, Z = 6mm� Point 4:

X = 80mm, Y = 0mm, Z = 5.8mm� Point 5:

X = 90mm, Y = 0mm, Z = 5.8mmf. Select Cancel to close the Point Definition

panel.

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Exercise 3B (3/6)

3. Create a spline.• Create a spline through the points. Apply

tangency at both ends of the spline.a. Select the Spline icon.b. Select the five points in the order of

creation.c. Select the YZ Plane to make the last point

tangent to it.d. Ensure the arrow points in the correct

direction. If not, select it to reverse its direction.

e. Select the first point in the Spline Definition plane.

f. Select the YZ Plane, and ensure the arrow points in the correct direction.

g. Select OK to complete the element.

3e3a

3c

3f

3g

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Exercise 3B (4/6)

4. Create a projection.• Create a projection of Guide Curve 2.

a. Select the Projection icon.b. Select Guide Curve 2.c. Select the ZX plane as the support. d. Select OK to create the projection.

5. Create a Point� Create a point to be used as a center point for a

circle.a. Create a point by coordinates at:

� X = 70, Y = 0, Z = 0

4b

4a

4d

4c

5a

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Exercise 3B (5/6)

6. Create a part Arc.• Using the Circle tool, create a part arc.

a. Select the Circle icon.b. Select Center and Radius from the Circle

type pull-down menu.c. Select the point created in the last step as

the circle center.d. The XY plane as the circle support.e. Enter a radius of [70mm].f. Select Part Arc.g. Start the arc at [135 deg] and end the arc

at [180deg]. h. Select OK to create the circle.

6a 6b

6c

6d

6f

6g

6h

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Exercise 3B (6/6)

7. Create a point.• Create another point to locate another circle

center.a. Create a point by coordinates at:

� X = 20, Y = 0, Z = 0

8. Create a part arc.• Using the Circle tool, create a part arc.

a. Select the Circle icon.b. Select Center and Radius from the Circle

type pull-down menu.c. Select the point created in the last step as

the circle center.d. The XY plane as the circle support.e. Enter a radius of [70mm].f. Select Part Arc.g. Start the arc at [0 deg] and end the arc at

[45 deg]. h. Select OK to create the circle.

9. Save and close the file.

8a

8g

8b 8f

8d

8c

8h

8e

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Exercise 3B: Recap

� Create a point

� Create a spline

� Create a projection

� Create a circle

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Step 3 - Create the Surface GeometryCop

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Use the following steps to create the model of the computer mouse :

1. Access the Generative Surface Design workbench.2. Create the wireframe geometry.

3. Create the surface geometry.4. Perform operations.5. Solidify the model.

Surface Design

Step 3: Create the surface geometry.In this section, you will learn some to the common tools used to create surface geometry.

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Why Create Surface Geometry?

For certain designs, the geometry can not be completely defined using the tools in the Part Design workbench. Complex 3D shapes often need to be defined using surface geometry which is created based on explicit wireframe construction geometry. Surface geometry can then be integrated into the final solid part definition.

When creating surface geometry keep in mind the following key points:A. Surface geometry can describe a more complex 3D shape.B. A surface element describes shape, therefore it has no thickness.C. Surface geometry can be completely integrated into the solid part so that modifications to the

surface are reflected in the solid.

Surface geometry

Solid geometry

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1

3

5

Creating an Extruded Surface

An extruded surface is created by extruding a profiles in a specified direction.

Use the following steps to create an extruded surface:

1. Select the Extrude icon.2. Select the profile to extrude.3. Specify the direction to extrude. The

direction can be specified using a line, plane, or edge. Direction can also be defined by right mouse clicking on the direction field. In this example, direction is specified using an existing line.

4. Enter limits.5. Select OK to generate the feature.

4

2

The extrude surface is similar to the pad feature in the Part Design workbench.

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2

3

Creating a Surface of Revolution

A revolve feature is created by revolving a profile about an axis.

Use the following steps to create a revolve feature:

1. Select the Revolve icon.2. Select the profile to revolve.3. Select the axis of revolution. In this

example, a predefined line is selected.4. Enter the angle limits.5. Select OK to generate the feature.

4

5

The revolve feature is similar to the shaft feature in the Part Design workbench.

The axis of revolution can be defined as an appropriate element in the model or using the Revolution Axis contextual menu.

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Creating a Sphere (1/2)

A sphere feature is a full or partial spherical surface.

Both complete and partial sphere required a center point and radius value.

Partial spheres require additional input to control the start and end angles for both the parallel and meridan curves.

Parallel curves can have an angle between –90 degrees and 90 degrees.

Meridan curves can have an angle between –360 degrees and 360 degrees.

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Creating a Sphere (2/2)

Use the following steps to create a sphere surface:

1. Select the Sphere icon.2. Select a point. The sphere will be created

about this point.3. Select an axis system. This axis system

determines the orientations of the meridian and parallel curves. If no axis system exist in the model, the default axis system for the model is used.

4. Enter radius of the sphere.5. Select the sphere limitations. Full or

Partial spheres can be generated.6. For a partial sphere, enter the start and

end angles for both the parallel and meridian curves.

7. Select OK to generate the feature.

1

2

4

5

6

7

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Creating a Cylinder Surface

A cylinder surface extrudes a circular profile in a specified direction.

Use the following steps to create a cylinder surface:

1. Select the Cylinder icon.2. Select a point. This point acts as the

center point for the circular profile that is to be extruded.

3. Select the cylinder axis direction. In this example the Z axis is selected from the contextual menu.

4. Specify the radius of the cylinder.5. Specify the length.6. Select OK to generate the feature.

3

6

2

4

5

The direction can be defined as an appropriate element in the model or using the Direction contextual menu.

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1

2

3

Creating Swept Surface – Explicit Subtype

Swept surfaces are created by sweeping a profile along a spine. The spine, by default, is the first selected guide curve.

Use the following steps to create a simple explicit type swept surface:

1. Select the Swept Surface icon.2. Select the profile.3. Select a guide curve.4. Select OK to complete the feature. 4

By default, the swept profile is constant in each section along the guide curve.

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Creating a Swept Surface – Reference Surface Option

By default, a swept surface uses the mean plane of the spine as the surface the profile is swept along. A user defined surface can also be used.

Use the following steps to apply a reference surface to a swept surface feature:

1. Select the With Reference Surface option from the dialog box.

2. Select the surface.3. If necessary, enter an angle. This angle is

measured between the profile and the reference surface.

1

2

3

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Creating a Swept Surface – Second Guide

Explicit swept surfaces can also be created using a second guide curve.

Use the following steps to add a second guide curve to a swept surface feature:

1. From the Subtype pull-down menu, select the With two guide curves option.

2. Select the profile.3. Select the first guide curve. This guide

curve, by default, will also act as the spine.

4. Select the second guide curve.5. Select OK to generate the feature.

1

3

2

4

5

The With two guide curves subtype is only available in the P2 configuration.

When a second guide curve is used, no reference surface is required.

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Creating a Swept Surface - Spine

A spine can control the orientation of the profile as it sweeps along the guide curve(s). By default the first guide is used as the spine for the swept feature.

If required, another element can be selected to act as the spine.

Use the following steps to change the spine:1. Select inside the Spine field.2. Select the new element.

1

2

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Creating a Swept Surface - Relimiters

By default, the swept surface will be created along the total length of the spine. Using points or planes the surface can be longitudinally reduced.

Use the following steps to relimit the swept surface:

1. Select inside the Relimiter 1 field.2. Select the relimiting element. In this

example, a point is selected.3. Select inside the Relimiter 2 field.4. Select the second relimting element. In

this example, a plane is selected.

1

2

2

4

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Creating an Offset Surface (1/2)

Use the Offset tool to create a surface offset from an existing surface.

Use the following steps to create an offset surface:

1. Select the Offset icon.2. Select the reference surface.3. Enter offset value.4. If necessary, select Reverse Direction to

change the direction of the offset.5. Use the Both sides option to create offset

surfaces on either side of the reference surface.

6. Select Repeat object after OK to create several surfaces separated by the same offset distance.

2

3

45

6

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Creating an Offset Surface (2/2)

Use the following steps to create an offset surface (continued):

7. Select OK.8. When the Repeat object after OK option

is selected the Object Repetition dialog box appears. Enter the number of instances to be created.

9. The new instances will be created in a new open body. To create the instances in the existing open body, clear the Create in a new Open Body option.

10. Select OK to create the surfaces. The resulting offset surface is parallel to the reference surface.

9

8

10

Side View

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4

Creating a Fill Surface (1/2)

Use the Fill Surface tool to create a surface inside a closed boundary. The boundary can consist of wireframe elements or edges of existing surfaces.

Use the following steps to create a fill surface:1. Select the Fill icon.2. Select the edges that will form the

boundary.3. Tangency can be applied at any

boundary, by selecting the boundary from the Fill Surface Definition box and selecting the support surface. In this example tangency is applied to the last boundary.

4. Specify the type of continuity between the support surface and the fill surface. In this example Tangent continuity is selected.

1

2c2b2a

2d3a

3b

The boundary must be closed. CATIA will allow small openings up to 0.1 mm in the closed wireframe boundary.

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Creating a Fill Surface (2/2)

Use the following steps to create a fill surface (continued):

5. If necessary, define a point though with the surface will pass.

6. If necessary, edit the boundary by adding additional elements the boundary, or replacing or removing existing elements or support support surfaces.

7. Select OK to generate the surface.

5

5

6

The boundary for the fill surface can be edited at any time after its creation by double-clicking on the feature from the specification tree or directly on the model.

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1

2

Creating a Blend Surface (1/4)

A blend surface is used to create a surface between two wireframe elements.

Use the following steps to create a blended surface:

1. Select the Blend icon.2. Select the first curve.3. If required, select the support for the first

curve.4. Select the second curve.5. If required, select the support for the

second curve.

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Use the following steps to create a blended surface (continued):

6. If supports are specified, define the type of continuity for each side. Continuity can be defined as:

a. Pointb. Tangencyc. Curvature

7. If required, select the Trim Supportoptions. When selected, the support surfaces are trimmed to the curve and are assembled into the blended surface.

6

6a 6b 6c

7

Different types on continuity can be specified on each side of the blend surface.

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8. If supports are specified, you can define tangency between the blended surface borders and the support surface borders. Tangency can be defined as:

a. Both extremitiesb. Nonec. Start Extremity onlyd. End extremity only

8a

First support

Second support

Firs

t bor

der

Sec

ond

bord

er

8b

8d

8c

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9. If required, specify tension at the blend surface limits. Tension can be specified as:

a. Default. b. Constantc. Lineard. S type

10. Select OK to generate the blend surface.

5

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Exercise 3C

In this exercise, you will open an existing part that contains the wireframe geometry needed to create the surface elements. You will use use surface tools discussed in this lesson to complete the surface geometry from the model. Detailed instruction is provided for this exercise.

By the end of this exercise you will be able to:� Create a revolved surface� Create an Extrude surface� Create a Swept surface

05 min

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Exercise 3C (1/4)

1. Open the part.• Open the Surface_Torch.CATPart model.

The wireframe geometry has been completed for you.a. For clarity, hide all points and Line.2

in the model.b. Create a new geometrical set called

Surfaces.c. Ensure the Surfaces geometrical set

is active.

1b

This model is the same as the model you created in Exercise 8a except a join feature has been created for you. This join feature is used to transform the polyline, line, and spline feautres into one feature. By joining the features, you can use it as a profile to create a revolve feature. You will learn more about the join feature in the next section of this lesson.

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Exercise 3C (2/4)

2. Create a revolved surface. • Create a revolved surface using the join

feature. The join feature is made up of the polyline, line, and spline features.a. Select the Revolve icon.b. Select the join feature.c. From the Axis contextual menu,

select the X-Axis.d. Enter [180 deg] in the Angle 2 field.e. Select OK to complete the operation.

2a

2b

2c2d

2e

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Exercise 3C (3/4)

3. Create an extruded surface.• Use the button hole sketch to create an

extruded surface.a. Select the Extrude icon.b. Select the button hole sketch.c. Extrude the sketch [100mm] in both

directions.d. Select OK to create the feature.

4. Create a sweep feature.• Create a swept surface.

a. Select the Swept Surface icon.b. Select the Circle.1 as the profile.c. Select Second Sweep Guide curve

as the guide curve.d. Select OK to create the feature.

3b

3c

3d

3a

4a

4b

4c

4d

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Exercise 3C (4/4)

5. Create a sweep feature.• Create a second swept surface using the

sketch and the helix.a. Select the Swept Surface icon.b. Select Sketch.4 as the profile.c. Select Helix.1 as the guide curve.d. Select OK to create the feature.

6. Save and close the model.

5c5b

5a

5d

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Exercise 3C: Recap

� Create a Revolve surface

� Create an Extrude surface

� Create a Swept surface

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Exercise 3D

In this exercise, you will open an existing part that contains the wireframe geometry needed to create the surface elements. Use the surface tools discussed in this lesson to complete the surfaces necessary for the phone model. Detailed instruction for the new topics are provided for this exercise.

By the end of this exercise you will be able to:� Create a swept surface� Create an extruded surface� Create a blended surface

30 min

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Exercise 3D (1/5)

1. Open the part.• Open the Surface_Phone.CATPart. The

wireframe geometry has been created for you.a. Create a new geometrical set called

Surfaces.b. Ensure the Surfaces geometrical set is

active.

2. Create a swept surface. • Create a swept surface between two guides.

a. Select the Swept Surface icon.b. From the Subtype menu, select With

two guides.c. Select the Profile sketch as the profile.d. Select Guide Curve 1 as the first guide

curve.e. Select Guide Curve 2 as the second

guide curve.

1b

2a

2b

2c2d

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Exercise 3D (2/5)

2. Create a Swept Surface (continued). e. Currently the profile is not aligned to

the guide curves. To locate the profile in the guide curves, set the anchor points.

f. Select inside the Anchor point 1 field.g. Select the top end point for the profile.h. Select inside the Anchor point 2 field.i. Select the bottom end point for the

profile.j. Select OK to complete the feature. 2g

2i

2h

2f

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Exercise 3D (3/5)

3. Create an extrude.• Create an extruded feature.

a. Select the Extrude icon.b. Select Spline.1 as the profile. c. Use the ZX plane as the support

surface.d. Enter [20mm] as Limit2.e. Select OK.

4. Create a blend.• Create a blend feature between the extrude

and the swept surface.a. Select the Blend icon.b. Select Spline.1 as the first profile.c. Select Extrude.1as the first support.d. Select Guide curve 1 as the second

profile.e. Select OK to create the blend.

3e

3c3b

3d

3a

4a

4c

4d

4e

4b

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Exercise 3D (4/5)

5. Create a blend.• Create another blend feature for the bottom

of the phone.a. Select the Blend icon.b. Select Guide Curve 2 as the first

profile.c. Select Project.1 as the second profile.d. Select OK to create the blend.

6. Create an extrude.• Create the top face of the phone using an

extrude.a. Create an extrude using Circle.1 as

the profile. Select the XY plane as the direction.

b. Specify [20mm] as the limits in both directions.

6d

5a

6b

5c5b

5d

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Exercise 3D (5/5)

7. Create an extrude.• Create another extrude to complete the

surface for the model.a. Create an extrude using Circle.2 as

the profile. Select the XY plane as the direction. Specify [20mm] as the limits in both directions.

8. Save and close the model.

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Exercise 3D: Recap

� Create a swept surface

� Create an extrude

� Create a blended surface

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Exercise 3E

In this exercise, you will open an existing part that contains the wireframe geometry needed to create the surface elements. Use the Surface tools discussed in this lesson to complete the surfaces necessary for a model of sunglasses. Detailed instruction for the new topics are provided for this exercise.

By the end of this exercise you will be able to:� Create an extrude� Create a fill� Create a swept surface� Create an offset surface

20 min

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Exercise 3E (1/5)

1. Open up the part.• Open the Surface_Glasses.CATPart. The

wireframe geometry has been created for you.a. Hide the CutOut geometrical set.b. Ensure the GlassesMain geometrical

set is active.

2. Create an extruded surface.• Extrude a surface to define the lens opening.

a. Select the Extrude icon.b. Select LensProfile as the Profile. c. Enter [60mm] for Limit 1.d. Enter [10mm] for Limit 2.e. Select OK.

1

2

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Exercise 3E (2/5)

3. Create an Offset Surface.• Offset Fill.1 by 2mm to define the thickness

of the sun glasses.a. Select the Offset icon.b. Select Fill.1.c. Apply a [2mm] offset toward the

inside.d. Select OK.

4. Create four Point-Point Lines.• Create four line elements between the

vertices of Fill.1 and Offset.1.

3b

4

4

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Exercise 3E (3/5)

5. Create a Fill Surface.• Create the top thickness surface of the sun

glasses.a. Select the Fill icon.b. Select the 10 edges required to form a

closed loop.c. Select OK.

6. Create two additional Fill Surfaces.• Create the bottom thickness and end surface.

There are 10 edges to select for the bottom thickness surface and 4 edges to select for the end surface.

5b

6

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Exercise 3E (4/5)

7. Prepare the model for cut out geometry.a. Hide the GlassesMain geometrical

set.b. Define CutOut as the active

geometrical set.

8. Create a Swept Surface. • Create a line sweep with reference surface.

a. Select CutOutCurve as GuideCurve1b. Select CutOutSurf as the Reference

surface.c. Enter an Angle of [120deg].d. Enter [3mm] for Length 2.e. Select OK to complete the feature.

7

8

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Exercise 3E (5/5)

9. Create an offset surface.• Offset CutOutSurf by 1mm.

a. Select the Offset icon.b. Select CutOutSurf. c. Apply a [1mm] offset towards the

inside.d. Select OK.

10.Clarify, and save and close the model.a. Hide all wireframe elementsb. Show the GlassesMain geometrical

set.c. Save the model.

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Exercise 3E: Recap

� Create an extruded surface

� Create a fill surface

� Create a swept surface

� Create an offset surface

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Step 4: Perform OperationsCop

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1. Access the Generative Surface Design workbench.2. Create the wireframe geometry.3. Create the surface geometry.

4. Perform operations.5. Solidify the model.

Surface Design

Step 4: Perform operations.In this section, you will learn how manipulate the surface geometry to create the final surface model.

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Why Are Operations on Geometry Needed? (1/2)

After the basic surface geometry is created, it may be composed of construction elements that do not describe the finished shape. Operations such as trim, join, extrapolate, and transform are then performed to produce the required finished geometry.

When performing operations, keep in mind the following key points:A. Operations are used to produce the finished geometry shape.B. Elements involved in an operation are kept in the history of the operation, but are hidden.C. Healing is an important capability that can be used to repair the gaps that exist in surface

geometry.

Surface fillet operation Healing Operation

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Why Are Operations on Geometry Needed? (2/2)

Transformations, such as scaling and affinity, help to resize the part. Transformation operations, such as translate and rotate, are required on the wireframe elements (e.g., lines and planes) to change the positioning of the part in the co-ordinate axis system.

When performing transformations, keep in mind the following key points:A. Affinity is an important operation to resize the part by different amounts in different directions,

according to a defined axis system. B. The Axis-to-Axis transformation is useful when more than one reference axis system and part

element is required to be moved from one axis to other.

A B

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Why Do You Need Joining Elements?

The Join tool is used to combine two or more elements into a single element that can be used in a future operation.

You can join:

A. Adjacent curves. In the example shown, two adjacent splines are joined.

B. Adjacent surfaces. In the example, four adjacent surfaces are joined.

Join result

Join result

A

B

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3b

Joining Elements

Use the following steps to join elements:1. Select the Join icon.2. Select the elements to be joined.3. Set options as necessary.

a. When the Check Tangency option is selected, the join feature will only be created if all elements to be joined are tangent.

b. When the Check connexity option is selected, the join operation will only be performed if the elements to be joined are connected.

c. The Simplify the result option reduces the number of resulting elements.

d. The Ignore erroneous elements option ignores the elements that do not allow the join to be created.

e. The Merging distance is the maximum distance below which two elements are considered as one.

4. Select OK to complete the feature.

2a

1

2b

3a

3d 3e

3c

4

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Joining Elements – Exclude Sub-Elements

While joining elements you can exclude some sub-elements from the joined surface.

Use the following steps to exclude sub-elements:

1. Select the elements to be joined.2. Select the Sub-Elements to Remove tab

to exclude sub-elements from the joined surface.

3. Select the elements to exclude.4. Select the Create join with sub-elements

option to create a second join surface with the excluded sub-elements.

1b1a

2

3

4

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Healing Elements

Healing is used to fill any gaps that may appear between two surfaces.

Use the following steps to heal geometry:1. Select the Heal icon.2. Select the surfaces to be healed.3. Define the merging distance. The merging

distance is the maximum gap distance between the surfaces that will be filled.

4. Define the distance objective. The distance objective is the threshold below which the gap will be ignored by the heal operation.

5. Select OK to complete the operation.

1

2a

2b

Gap

34

5

Healing is often necessary when importing surfaces.

A join feature can also be healed.

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Splitting Elements - Introduction

Use the Split tool to remove unwanted portions of wireframe and surface elements.

You can split :A. Wireframe elements. Wireframe elements

can be split by points, other wireframe elements, or surfaces

B. Surfaces. Surfaces can be split by wireframe elements, or other surfaces.

Cutting elements

Element to be cut

Cutting elements

Element to be cut A

B

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Splitting Elements (1/4)

Use the following steps to split an element:1. Select the Split icon.2. Select the element to cut.3. If necessary:

a. Select additional elements to cut by selecting the bag icon.

b. Select the additional elements.c. Select Close to close the Elements to cut

dialog box.4. Select inside the cutting elements

window.5. Select the cutting element(s).

1

3b3b

5

3a

4

3c

5

You can split one or more elements with one or more cutting elements at one time.

A surface can be split using a plane, a surface or a line. The line has to lie on the surface you want to split.

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Use the following steps to split an element (continued):

6. Specify options.a. The keep both sides option lets you keep

both sides of the element to be cut. If the option is selected, the result is two split features. This option is only available if one cutting element is selected.

b. Select the Intersections computationoption to create an intersect feature between the cut element and the cutting element(s).

c. Clear the Automatic extrapolation option if you do not want to automatically extrapolate the cutting element so that the operation can be processed.

6a

6b

6c

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Use the following steps to split an element (continued):

7. To change the side of the cutting element to be kept, select the cutting element in the list and select the Other side button.

8. Select OK to confirm the split operation. 9. Notice that because two elements were

cut, two split features are added to the specification tree.

8

7

9

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Cutting elements that consist of closed loop curves require additional input to precisely define the side of the cut to keep.

A. Without selecting a support, the system cannot fully define the cutting area.

B. When a support plane is selected, the system can determine the normal vector to the support plane (Vn). A second vector that is tangent to the cutting element is then calculated (Vt). The area to keep is determined by the vector product (V) of the vector normal (Vn) and vector tangent (Vt). This vector is calculated at each point about the cutting curve.

Support

VnVtV

VnVt

V

A

B

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Trimming Elements - Introduction

The trim tool is used to trim two intersecting elements and keep only part of them.

You can trimA. Two wireframe elementsB. Two surfaces.

B

A

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1

2

Trimming Elements

Use the following steps to trim elements:1. Select the Trim icon.2. Select the elements to be trimmed. Select

the elements on the portion you want kept.

3. If required, change the side to be kept by selecting the Other side of elementbuttons.

4. Select OK to perform the trim operation. The trim element is added to the specification tree.

3

2

4

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Why Use Fillets?

Fillets are used to remove sharp edges on parts. Fillets, along with drafts, help in the easy removal of material from molds. Fillets also help in reducing stress concentration in parts.

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Fillet Extremities

Creating fillets using surfaces gives greater control to the resulting element. For example, the connection between the fillet and the support surface(s) can be customized to create the desired geometry. There are four options available to control the extremities of a fillet:

A. The Smooth option connects the fillet surface to the support surface with a tangency constraint.

B. The Straight option connects the fillet with no tangency constraints.

C. The Maximum option extends the fillet to the longest selected support edge.

D. The Minimum option trim the fillet to the shortest selected support edge.

DC

BA

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1

3

Creating a BiTangent Shape Fillet

Shape fillets are used to create a fillet between two surfaces.

Use the following steps to create a BiTangentshape fillet:

1. Select the Fillet icon.2. Select the two surfaces/faces.3. Enter the radius value.4. Ensure the red arrows point towards the

concave side for the fillet. If not, select on the arrow to change its direction.

5. Specify the Extremities conditions.6. Clear the Trim Support options to not have

the supporting elements assembled into the fillet feature.

7. Select OK to create the shape fillet. 2

24

6

5

7

The other fillet type available from the Shape Fillet Definition panel is a Tritangentfillet. A Tritangentshape fillet is similar to a Tritangent fillet (discussed latter in this lesson) except that a Tritangent shape fillet is created between three separate surfaces and a Tritangent fillet is created between three faces of the same fillet.

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1

2

Creating an Edge Fillet

The Edge Fillet tool is used to provide a transitional surface along a sharp edge of a surface. Similar to Edge fillets in the Part design workbench, you can select edges or faces to be filleted.

Use the following steps to create an edge fillet:1. Select the Edge fillet icon.2. Select the edge(s) of the surface to be

filleted.3. Enter the radius value.4. Specify extremity conditions.5. Select OK to generate the edge fillet.

3

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Creating a Variable Radius Fillet

Use the Variable Radius Fillet tool to create a fillet on a selected edge whose radius varies at selected points.

Use the following steps to create a variable radius fillet:

1. Select the Variable Fillet icon.2. Select one or more internal edges of a

single surface.3. To add additional points, select inside the

Point field then select anywhere on the edge to place the point, or select a pre-existing point for better accuracy.

4. Double-click on a radius value to modify it.5. Select OK to complete the fillet.

3

4

2

5

You can specify a zero radius value at limit points of a variable radius fillet.

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1

2

Creating a Face-To-Face Fillet

The Face-Face fillet is used when there is no intersection between the selected faces or when there are more than two sharp edges between the faces.

Use the following steps to create a face-face fillet:

1. Select the Face-Face icon.2. Select the two faces. The fillet is created

between these faces. The selected faces must belong to the same surface.

3. Enter a radius value.4. Select OK to create the fillet.

2

3

4

In this example, two separate extrude surfaces were joined using Join operation to create the single surface required for the Face-Face fillet.

The shape of the Face-To-Face Fillet can be visualized as laying a Cylinder with a specific radius into the gap between two faces. If the radius is too small, the Cylinder will not be able to touch both faces at once. If the radius is two big, it will not be able to achieve a Cylinder tangent to the faces.

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3

Creating a Tritangent Fillet

A Tritangent fillet creates a transitional surface by removing one of three selected surface. The fillet surface is created tangent to the three selected faces.

Use the following steps to create a tritangent fillet:

1. Select the Tritangent icon.2. Select the two faces to keep.3. Select the face to remove.4. Select OK to complete the feature.

4

2

The Tri-Tangent fillet is available in HD2 configuration.

A surface tritangent fillet is similar to a tritangentfillet created in the Part-Design workbench.

The selected faces must be from the same surface.

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Extrapolating Elements - Introduction

The Extrapolate tool is used to extend a surface or curve. It is often used to extend an element past another so that later these elements can be trimmed, split, or intersected.

Extrapolations can be limited:A. Up to elementB. At a specified length

BA

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Extrapolating Elements (1/2)

Use the following steps to extrapolate an element:

1. Select the Extrapolate icon.2. For a surface, select the edge

representing the boundary to be extrapolated. For a curve, select the end point of the curve.

3. Select the surface or curve to be extracted.

4. A preview of the extrapolated surface is shown.

3

2

4

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Extrapolating Elements (2/2)

Use the following steps to extrapolate an element (continued):

5. Specify the extrapolation mode. The default extrapolation mode is Length. In this example, the extrude extrapolation type is Up to element.

6. Depending on the extrapolation mode, select element or specify the length.

7. Select OK.

5

6 7

6

Select the Assemble result option to assemble the extrapolate surface to the support surface.

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Transformations (1/3)

Transformations are used to modify the size, location, and orientation of a wireframe or surface element.

The following six transformation types are available:

A. The Translation tool is used to move a selected element. Translation can be made by specifying a direction and distance, selecting start and end points, or using coordinates.

B. The Rotation tool is used to rotate a selected element about an axis.

A

B

The Hide/Show initial element button is used to hide the original element after the transformation.

The Repeat after OK option lets you create multiple instances of the original feature each separate by an equal value.

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The following six transformation types are available (continued):

C. The Symmetry tool is used to create the mirror image of the selected element. The element can be mirrored about a point, line, or plane.

D. The Scaling tool is used to resize a selected element. The element is scaled about a selected point, plane, or planar surface using a scaling factor.

C

D

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The following six transformation types are available (continued):

E. The Affinity tool scales the selected element in the X, Y, or Z direction based on a selected axis system.

F. The Axis to Axis tool duplicates and positions selected geometry based on a new axis system.

E

F

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Boundary Curves

Use the Boundary tool to create boundary curves of internal or external surface edges.

When defining the boundary, only one element needs to be selected. Using the correct propagation type, the remaining boundary is automatically determined. The propagation of a selected edge can be defined by:

A. Using the Complete boundary option, the selected edge is continued about the entire surface boundary.

B. Using the Point continuity option, the selected edges is continued about the surface boundary until a point discontinuity is met.

C. Using the Tangent continuity option, the selected edge is propagated about the surface boundary until a tangent discontinuity is met.

D. Using the No propagation option only the selected edge is used to create the boundary curve.

A B

C D

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1

2

Creating Boundary Curves

Use the Boundary tool to create boundary curves of internal or external surface edges.

Use the following steps to create a boundary curve:

1. Select the Boundary icon.2. Specify the propagation type.3. Select the surface edge.4. If necessary, limit the boundary curve

using points or vertices.a. Select in the Limt1 field.b. Select the first limiting elementc. Select in the limit2 fieldd. Select the second limiting element.

5. Select OK to generate the boundary curve. 3

4a

4b

4d

4c

5

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2

3

Extracting an Edge from a Surface

The Extract tool is used to extract sub-elements from a surface. Edges and surface faces can be extracted from the original surface.

To extract an edge from a surface use the following steps:

1. Select the Extract icon.2. Select a surface edge.3. Specify the propagation type. In this

example, Tangent continuity is selected.4. Select OK to complete the extraction.

4

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4

Extracting a Face from a Surface

You can also use the Extract tool to extract one or several faces of a surface with or without propagation.

Use the following steps to extract a face from a surface.

1. Select the Extract icon.2. Select the face.3. Specify the propagation type. In this

example Point continuity is selected.4. Select OK to complete the extraction.

1

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Step 5: Solidify the ModelCop

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1. Access the Generative Surface Design workbench.2. Create the wireframe geometry.3. Create the surface geometry.4. Perform operations.

5. Solidify the model.

Surface Design

Step 5: Solidify the model.In this section, you will learn how create a solid model from the surface elements.

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Why Complete the Geometry in Part Design?

Use the Part Design workbench to integrate surface geometry into a solid part. The hybrid modeling capability of V5 enables the complex surface geometry to shape the solid part.

Keep in mind the following key points when solidifying a model:A. The Part Design workbench is used to produce solid geometry from complex surfaces.B. Modifications to the surface geometry are reflected in the solid part.

Surface geometry

Wireframe geometry

Solid geometry

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How Can Solids be Created or Manipulated by Surfaces?

Surface features enable you to create complex shapes that would be difficult to create using only solid geometry.

Using the Surface-Based Feature toolbar you can use surface geometry to:

A. Split a solid body.B. Create a solid body be thickening the

surface.C. Close the surface geometry into a solid

body.D. Combine a surface into a body to add or

remove material.DC

BA

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1

2

Splitting a Body with a Surface

Use the Split tool to split a body using a plane, face, or surface.

Use the following steps to split a body using a surface:

1. Select the Split icon.2. Select the splitting element.3. The arrow indicates the portion of the solid

body that will be kept. Click on the arrow to change its direction if necessary.

4. Select OK to split the body3

4

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2

Thickening a Surface

Use the Thicken tool to add thickness to surface.

Use the following steps to thicken a surface:1. Select the Thick Surface icon.2. Select the surface.3. The arrow indicates the first offset

direction. Click on the arrow to change its direction if necessary.

4. Enter offset values5. Select OK to thicken the surface.

3

4

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12

Closing a Surface into a Body

Use the Close tool to close a surface.

Use the following steps to split a body using a surface:

1. Select the Close Surface icon.2. Select the surface.3. Select OK to complete the operation.

3

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2

Sewing a Surface into a Body

The Sew Surface tool is used to combine a surface into a body. It can be used to add or remove material.

Use the following steps to sew a surface into a body:

1. Select the Sew Surface icon.2. Select the surface.3. The arrow indicates the portion of the

solid body that will be kept. Click on the arrow to change its direction if necessary.

4. Select OK to complete the operation. 3

4

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To Sum Up...Cop

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To Sum Up ...

Using the knowledge learned in this lesson, you should now be able to create the model of the computer mouse:

� Access the Generative Surface Design workbench.

� Create the wireframe geometry. � Create the surface geometry.� Perform operations.� Solidify the model.

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Exercise 3FCop

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Exercise 3F

In this exercise, you will open an existing that contains wireframe and surface geometry and use the tools learned in this lesson to complete the flashlight model. Detailed instruction for this exercise is provided.

By the end of this exercise you will be able to:� Trim elements� Join elements� Rotate an element� Apply Symmetry� Thicken a surface feature

20 min

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Exercise 3FCop

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Exercise 3F (1/6)

1. Open the part file.• Open the existing part file,

Operations_Torch.CATPart. This file contains wireframe and surface elements.

2. Rotate the join feature. • The join feature needs to be rotated 90 deg

so that it can be used as the guide curve for a swept surface feature.

a. Ensure the Wireframe geometrical set is active.

b. Select the Rotate icon.c. Select Join.1 from the Wireframe

geoemtrical set.d. Rotate the Join feature about the x-

axis.e. Enter [90deg].f. Select OK to complete the

transformation.

2c

2b

2d2e

2f

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Exercise 3F (2/6)

3. Create a sweep feature.• Create a swept surface.

a. Activate the Surface geometrical set.b. Create a swept surface using the

Sweep Profile sketch as the profile and the Rotate feature as the guide curve.

4. Trim elements. • Trim the revolve feature and the swept

surface.a. Select the Trim icon.b. Select Revolute.1.c. Select swept feature created in the

last step.d. Use the Other side of element

buttons to create the trim as shown.e. Select OK to complete the operation.

2c

3

4a

4b

4c

4d

4e

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Exercise 3F (3/6)

5. Trim elements.• Trim the extrude and the trim.

a. Select the Trim icon.b. Select Trim.1.c. Select the Extrude element.d. Use the Other side of element


6. Mirror elements. • Mirror the trimmed elements.

a. Select the Symmetry icon.b. Select Trim.2.c. Mirror about the ZX plane.d. Select OK to complete the operation.

5a

6b

5b

6d

5c5d

5e

6a

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Exercise 3F (4/6)

7. Join elements.• Join the symmetry element and the trim.

a. Select the Join icon.b. Select Symmetry.1.c. Select Trim.2.d. Select OK to complete the operation.

8. Trim elements. • Trim the swept surface and the trim.

a. Select the Trim icon.b. Select Join.2.c. Select the swept surface as shown.d. Use the Other side of element

buttons to create the trim.e. Select OK to complete the operation.

7a

8e

8a

8d

7d

8c

The Wireframe elements have been hidden for clarity.

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Exercise 3F (5/6)

9. Trim elements. • Trim the swept feature and the trim.

a. Select the Trim icon.b. Select Trim.3.c. Select the swept surface as shown.d. Use the Other side of element


9a

9d

9c

9e


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Exercise 3F (6/6)

10.Solidify the model. • Create a solid model.

a. Access the Part Design workbench.b. Activate the PartBody.c. Select the Thick Surface icon.d. Select Trim.4.e. Ensure the arrows point outward.

Select Reverse Direction if necessary to change the offset direction.

f. Apply [3mm] thickness to the outside of the model.

g. Apply [2mm] thickness to the inside of the model.

h. Select OK to complete the operation.

11.Save and close the file. • Hide both the Wireframe and the Surface

geometrical sets.

10c

10h

10e

10g10f


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Exercise 3F: Recap

� Trim elements

� Join elements

� Rotate an element

� Apply Symmetry

� Thicken a surface feature

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Exercise 3GCop

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Exercise 3G

In this exercise, you will open an existing file that contains the wireframe and surface geometry necessary to complete the model. You will use the tools learned in this lesson to perform operations and solidify the model. High-level instruction for this exercise is provided.

By the end of this exercise you will be able to:� Join surfaces� Trim surfaces� Mirror � Close a surface

15 min

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Exercise 3GCop

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Exercise 3G (1/5)

1. Open part file.• Open the existing part file,

Operations_Phone.CATPart. The wireframe and surface geometry has been created for you.

a. Create a new geometrical set called Operations.

b. Ensure the Operation geometrical set is active.

2. Join the top and side surfaces. • Join Blend.1, Blend.2 and Sweep.1 to create

the top and side surface.a. Select the Join icon.b. Select Blend.1, Blend.2, and

Sweep.1.c. Select OK.

2

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Exercise 3G (2/5)

3. Trim the surfaces.• Trim the top extrude and the join.

a. Select the Trim icon.b. Trim Extrude.2, and Join.1c. Use the Other side of element buttons

to create the trim as shown.d. Select OK to complete the operation.

4. Trim the surfaces.• Trim the bottom extrude and the trim feature.

a. Select the Trim icon.b. Trim Extrude.3, and Trim.1.c. Use the Other side of element buttons

to create the trim.d. Select OK to complete the operation.

3

4

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Exercise 3G (3/5)

5. Mirror the model.• Use the Symmetry tool to create the other

side of the model.a. Select the Symmetry icon.b. Mirror Trim.2 about the ZX plane.c. Select OK to complete the operation.d. Hide Extrude.1 from the Surface

geometrical set.

6. Join the surface.• Complete the surface model by joining the

two halves.a. Select the Join icon.b. Select Trim.2 and Symmetry.1.c. Select OK to complete the operation.

5

6

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Exercise 3G (4/5)

7. Solidify the model.• Use the Close surface tool to solidify the

model.a. Access the Part Design workbench.b. Activate the PartBody.c. Select the Close Surface icon.d. Select Join.2 as the object to close.e. Select OK to complete the operation.

8. Add variable fillets.• Complete the model by adding fillets. In this

step, add variable fillets to the bottom side edges.a. Select the Variable Edge Fillet icon.b. Select the bottom two side edges of

the model.c. Create the fillets with a [2mm] radius

at the top and [4mm] radius at the bottom.

d. Select OK to complete the operation.

7c

8

7d

7e

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Exercise 3G (5/5)

9. Apply edge fillets.• Create edge fillets for the top and middle

side edges.a. Select the Edge Fillet icon.b. Select the top and middle edges on

both sides (four edges).c. Use a [2mm] radius.

10.Apply edge fillets.• Complete the model by adding 2mm edge

fillets to the top and bottom faces of the model.

11.Save and close the model.

10

9

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Exercise 3G: Recap

� Join surfaces

� Trim surfaces

� Mirror

� Close a surface

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Exercise 3HCop

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Exercise 3H

In this exercise, you will open an existing part that contains the wireframe and surface geometry needed to create a model of a pair of sunglasses. Use the Surface tools discussed in this lesson to perform operations that will complete the model. Detailed instruction for the new topics are provided for this exercise.

By the end of this exercise you will be able to:� Create an extrude� Create a fill� Create a swept surface� Create an offset surface

20 min

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Exercise 3H (1/5)

1. Open up the part.• Open the Surface_Glasses_2.CATPart.

a. Hide the CutOut geometrical set.b. Ensure the GlassesMain geometrical

set is active.

2. Perform a Join Operation.• Join the surfaces in GlassesMain.

a. Select the Join icon.b. Add the following surfaces to the join:

Fill.1, Offset.1, Fill.2, Fill.3, and Fill.4.c. Select OK.

3. Trim Extrude.2 and Join.5.• Create the cutout for the lens by using a trim

operation.a. Select the Trim icon.b. Select Extrude.2 as Element 1. c. Select Join.5 as Element 2.d. Select Other Side in order to achieve

the desired result.e. Select OK.

2b

3b

3c

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Exercise 3H (2/5)

4. Prepare the model for the cutout.• Change visibility settings.

a. Hide the GlassesMain geometrical set.

b. Ensure the CutOut geometrical set is active.

c. Hide CutOutSurf.

5. Trim Sweep.1 and Offset.2.• Trim the two surfaces.

a. Select the Trim icon.b. Select Sweep.1 as Element 1. c. Select Offset.2 as Element 2.d. Select Other Side as necessary in

order to achieve the desired result.e. Select OK.

5d

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Exercise 3H (3/5)

6. Split Trim.2 with Extrude.2.• Split the cut out with the lens cut out.

a. Select the Split icon.b. Select Trim.2 as the Element to cut. c. Select Extrude.2 from the

GlassesMain geometrical set as the Cutting Element.

d. Select Other Side as necessary in order to achieve the desired result.

e. Select OK.

7. Trim Split.3 and Trim.1.• Trim the two surfaces.

a. Define GlassesMain as the active geometrical set.

b. Select the Trim icon.c. Select Split.3 as Element 1. d. Select Trim.1 as Element 2.e. Select Other Side as necessary in

order to achieve the desired result.f. Select OK.

6b

6c 6d

7e

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Exercise 3H (4/5)

8. Create a Tritangent Fillet.• Create a fillet on the arm of the sun glasses.

a. Select the Tritangent Fillet icon.b. Select the top and bottom fill surfaces

as the Faces to Fillet.c. Select the end fill surface as the Face

to remove.d. Ensure that the Trim Support option

is selected.e. Select OK.

9. Mirror TritangentFillet.1.• Mirror the surface skin about the YZ plane.

a. Select the Symmetry icon.b. Select TritangentFillet.1 as the

Element. c. Select the YZ plane as the

Reference.d. Select OK.

8c

8b

9b9c

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Exercise 3H (5/5)

10.Join TritangentFillet.1 and Symmetry.1.• Join the two halves of the sun glasses.

a. Select the Join icon.b. Select TritangentFillet.1 and

Symmetry.1 as the Elements to Join.c. Select OK.

11.Clarify, and save and close the model.• Hide all wireframe elements and save the

model.

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Exercise 3H: Recap

� Perform a Join operation

� Trim surfaces

� Split surfaces

� Use Transformations

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Case Study: Surface Design

In this exercise, you will create the case study model. Recall the design intent of this model:

� Model contours are likely to change.

� Wireframe, surface, and solid geometry must be kept separate.

� Buttons must be built as a separate body but update when changes are made to the main body.

Using the techniques you have learned in this and previous lessons, create the model with only high-level instruction.

40 min

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Do It Yourself: Model of Computer Mouse (1/15)

You must complete the following tasks:

1. Create a new part file.• Create a new part file. Create a

geometrical set inside the part called Wireframe and make the Wireframe geometrical set active.

2. Create a semi-circle.• Create a semi-circle. • Create the center point for the circle at:

X = -44.45, Y = 0, Z = 0• Have the circle run though a point located

at:X = 0, Y = 0, Z = 0

• Create the circle starting at –90deg and ending at 90deg.

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You must complete the following tasks (continued):

3. Create a spline.• Create a spline through the following points:

Pt1: X = 6.65, Y =0.00, Z = 12.70.Pt2: X = -38.10, Y = 0.00, Z = 25.40.Pt3: X = -69.85, Y = 0.00, Z = 31.75Pt4: X = -121.92, Y = 0.00, Z = 12.70Pt 5: X = -139.70, Y = 0.00, Z = 0.00

4. Intersect elements.• Using the Intersect tool to intersect the

Spline with the YX plane.

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4

All dimensions are in millimeters.

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5. Project elements.• Project the semi-circle endpoints onto the

YZ plane.

6. Create trimmed circle.• Create another circle using the Trimmed

Circle option. Create the circle through the intersected and projected points.

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7. Create a spline.• Create a spline through the following

points:Pt1: X = 0.00, Y =38.10, Z = 0.00.Pt2: X = -38.10, Y = 38.10, Z = 0.00.Pt3: X = -68.58, Y = 44.45, Z = 0.00Pt4: X = -85.09, Y = 50.80, Z = 0.00Pt 5: X = -114.30, Y = 38.10, Z = 0.00Pt 6: X = -127.00, Y = 0.00, Z = 0.00

• Create the last point tangent to the ZX plane.

7All dimensions are in millimeters.

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8. Create a new geometrical set.• Create a new geometrical set called Body

surfaces and ensure it is active.

9. Create a swept surface.• Create a swept surface using circle.2 as the

profile and spline.1 as the guide curve.

10. Create an extrude.• Create an extruded surface using Spline.2

as the profile. Extrude the surface [24.5mm] in the direction of the XY plane.

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11. Create an extrude.• Create an extruded surface using Circle.1

as the profile. Extrude the surface [24.4mm] in the direction of the XY plane.

12. Create a blend.• Create a blended surface to connect the

two extruded surface. • Apply a tensions on the blend as shown.

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13. Create a shape fillet.• Create a [25.4mm] shape fillet between the

two extruded surfaces.

14. Perform a join operation.• Join Blend.1 and Fillet.1 using the Join

operation.

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15. Extrapolate an edge.• Extrapolate the edge of the sweep

[12.7mm].

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16. Trim surface.• Trim Join.1 and Extrapol.1.

17. Solidify the model.• Activate the part body and use the close

surface tool to solidify Trim.1.

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18. Offset a surface.• Reactivate the Body Surfaces geometrical

set. • Offset Sweep.1 using the offset tool [5mm].

19. Extrapolate the boundary.• Extrapolate the edge of the offset surface

[12mm].

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20. Create a sketch.• Create a plane [46mm] above the XY

plane. Use this plane as the sketch support to create the sketch shown.

• Project the three curves along the front of the mouse and create a vertical line from the loser endpoint to a location on the upper curve. Use the trim tools to trim the upper projected line to the vertical line.

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21. Create a pocket.• Use the sketch as the profile for a pocket

feature. Extrude the pocket up to the extrapolated offset surface.

• Create the pocket as a Thin using 2mm thickness.

22. Add thickness.• Use the Thickness tool to add [–3mm] of

thickness to the top of the pocket surface.

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23. Add thickness.• Use the Thickness tool to add [–1mm] to

the back surface.

24. Create a new body.• Create a new body called Button.

25. Create a sketch.• Copy Sketch.1 from the pocket into the

Button body.• Edit the sketch as shown.

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26. Create a pad feature.• Create a pad feature using the copied

sketch. Limit the pad feature between Sweep1and extrapolate.2.

27. Shell the buttons• Hide the PartBody and shell the buttons to

a [2mm] inside thickness.• Select OK to the warning message.• Remove all bottom and inside faces from

the pad feature.

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28.Clarify the display.• Show the PartBody and the Buttons body.

Hide the Wireframe and Body Surfaces geometrical sets.

29.Save and close the model.

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Case Study: Surface Design Recap

� Create points

� Create splines

� Create projections

� Create intersections

� Create circles

� Create swept surfaces

� Create extrudes

� Create blends

� Create fillets

� Perform a join operation

� Extrapolate a boundary

� Trim elements

� Offset elements

� Close a surface

Edu Cat e v5e Af v5r15 Lesson3 Toprint

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Transcript of Edu Cat e v5e Af v5r15 Lesson3 Toprint