Eng dwg 1011-1_wk2_gc_&_2d
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Transcript of Eng dwg 1011-1_wk2_gc_&_2d
Week 2Week 2MME 1211, Sections 5 & MME 1211, Sections 5 &
88
Geometrical constructionsGeometrical constructions
Locating points anddrawing lines
Construction of angles
Types of polygons
Parts of a circle
Solid types
Bisection of lines and angles
Bisection of lines
Dividing a line into equal and proportional
parts
Construction of triangles
Construction of pentagon and hexagon
Drawing of a hexagon and octagon
Drawing of circle
Tangency
Drawing tangents to circles
Drawing arc tangents
Drawing arc tangents
Drawing arc tangents
Drawing arc tangents
Drawing arc tangents
Drawing an ogee curve
Conic sections
Construction of an ellipse
Construction of an ellipse
Construction of an ellipse
Construction of an ellipse
Drawing tangents to an ellipse
Drawing of a parabola
Drawing of a hyperbola
Drawing helix and involute
Extend Figure Trim Figure 2D Fillet 2D Chamfer Mirror Move Rotate Repeat Template Shape Offset Constraints
CAD-Editing and Modifying Tools
Extend Figure
Extend is used to extend the sketched entity to intersect the next available entity.
The sketched entity is extended up to its intersection with another sketched entity or a model edge.
Trim Figure To remove unwanted intersect
portion of a sketched element
2D Fillet To create a corner between 2
intersection with a given radius
Sketched entities before and after filleting
Sketched entities before and after filleting
2D Chamfer
To create a chamfer of a figure with a given distance. Default 45 degree.
Mirror
Creating a reflection copy of the figure about an axis line
Move is used to move the selected entities from
its base location to a desired location.
Start point of translation
End point of translation
Rotate
is used to spin the selected entities from its base location to a desired location.
Centre point of rotation
RepeatWhile sketching the base feature of a model, sometimes you may need to place the sketched entities in a particular arrangement such as along linear edges or around a circle.
Base feature with slots created about linear edges
Base feature with slots created around a circle
Repeat: Linear
original
horizontal linear path
vertical linear path
Repeat: Circular
original
centre of rotation
Practice 1-1In this practice, you will draw the sketch shown in Figure B on one side and then mirror it on the other side. The solid model is given only for your reference. Use Dimension tool to dimension the sketch accordingly.
Figure A Model for Practice 1-1 Figure B Sketch of Practice 1-1
Editing and Modifying Tools
Template Shape Offset
Shape
Creating a template or pattern of shape shown above:
1. Round 2. Square3. Obround4. Rectangle
1 2 3 4 5 6 7
Shape-Pattern Type
Offset Offset an element(s) at a specified
distance.
Offsetting a chain of entities Offsetting a single entity
Constraints
1. Fix2. Vertical3. Horizontal4. Intersection5. Symmetric6. Coradial7. Concentric
8. Colinear9. Coincident10. Midline11. Equal12. Tangent13. Perpendicular14. Parallel
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Constraint are used to add relationship between sketched entities to capture the design intent. Below are constraints, some of which are applied automatically.
Horizontal constraint : forces one or more selected lines to become horizontal
Vertical constraint : forces one or more selected lines to become vertical
Fix constraint : forces the selected entity to be fixed at the specified position.
Constraint Term Definitions
Intersection constraint : forces the selected point to move at the intersection of two selected lines
Intersection between 2 lines
Original Position
Circle new position when applied intersection constraint
Symmetric constraint : forces two selected lines, arcs, points and ellipses to remain equidistant from a centreline or reference line. This constraint also forces the entities to have the same size and orientation.
Constraint Definition cont...
Coradial constraint : forces the selected arcs or circles to share the same radius and the same centre points.
Concentric constraint : forces the selected arcs and circles to share the same centre points with other arc, circle, point, vertex or circular edge.
Colinear constraint : forces the selected lines to lie on the same infinite line
Constraint Definition cont...
Midline constraint : forces the selected point to move to the midpoint of a selected line.
Equal constraint : forces the selected lines to have equal length and the selected arcs, circles to have equal radii.
Coincident constraint : forces the selected point to be coinceident with the selected line, arc, circle, or ellipse.
Constraint Definition cont...
Tangent constraint : forces the selected arc, circle, spline or ellipse to become tangent to the other arc, circle, spline, ellipse, line or edge.
Perpendicular constraint : forces the selected lines to become perpendicular to each other.
Applying the Tangent relation to a line and a circle
Entities before and after applying Perpendicular relation
Constraint Definition cont...
Entities before and after applying Parallel relation
Parallel constraint : forces the selected lines to become parallel to each other.
Constraint Definition cont...
Draw the sketch shown below. Use Tangent Constraint to connect the line to the outer arc and Trim the access entities.
Practice 2-1
Class Assignment c1w2Draw the hand-wheel shown below using the editing and modifying tools that you have learned. Unit = mm
Draw the figure shown below using the editing and modifying tools that you have learned. Unit = mm
Class Assignment c2w2
Draw the Figure shown below. Dimensions are in inches
Class Assignment c3w2