Autocad 2d Module 17 PDF
8
Learning Outcomes: AutoCAD ® Self-paced Learning Modules AutoCAD 2D Module 17 Multiview Drawings When you have completed this module, you will be able to: 1. Describe multiview drawings, the glass box principle, the three standard views, object lines and hidden lines. 2. From a 3D pictorial object, draw a multiview drawing using the three standard views. NOTE: If you understand multiview drawings, hidden lines and can draw the three standard views of an object, skip this module and go directly to Module 18. Multiview Drawing The drafting and design world uses a system of representing a three dimensional object drawn with two dimensional views. This is called a multiview drawing. To explain this system of drawing, the object shown in Figure 17-1 will be used. To draw the two dimensional views of each side of the object, place a imaginary plane parallel to Figure 17-2 Projecting the 2 Dimensional View The Glass Box Principle each of its six sides and project the view of the object (perpendicular) onto each plane. This is called orthographic projection. Imagine the plane to be a sheet of glass. See Figure 17-2. Figure 17-1 3 Dimensional Object To carry this principal further, place a plane on each side of the object for a total of six planes or sheets of glass to make a glass box. See Figure 17-3. Picture unfolding the glass box onto a flat two dimensional plane. All six views are now Figure 17-3 The Glass Box Principle visible at the same time as you can see in Figure 17-4. The six views are named Top, Front, Right Side, Left Side, Rear, and Bottom. Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007 Module 17 Click here to buy A B B Y Y P D F T r a n s f o r m e r 2 . 0 w w w . A B B Y Y . c o m Click here to buy A B B Y Y P D F T r a n s f o r m e r 2 . 0 w w w . A B B Y Y . c o m
-
Upload
faizanmirani -
Category
Documents
-
view
169 -
download
0
Transcript of Autocad 2d Module 17 PDF
Learning Outcomes:
AutoCAD® Self-paced Learning Modules
AutoCAD 2DModule 17
Multiview Drawings
When you have completed this module, you will be able to:
1. Describe multiview drawings, the glass box principle, the three standard views, objectlines and hidden lines.
2. From a 3D pictorial object, draw a multiview drawing using the three standard views.
NOTE: If you understand multiview drawings, hidden lines and can draw the threestandard views of an object, skip this module and go directly to Module 18.
Multiview DrawingThe drafting and design world uses a system of representing athree dimensional object drawn with two dimensional views. Thisis called a multiview drawing. To explain this system of drawing,the object shown in Figure 17-1 will be used.
To draw the twodimensional views of eachside of the object, place aimaginary plane parallel to
Figure 17-2Projecting the 2 Dimensional View
The Glass Box Principle
each of its six sides andproject the view of theobject(perpendicular)onto each plane.This is calledorthographicprojection. Imaginethe plane to be asheet of glass. SeeFigure 17-2.
Figure 17-13 Dimensional
Object
To carry this principal further, place a plane on each side ofthe object for a total of six planes or sheets of glass to makea glass box. See Figure 17-3. Picture unfolding the glassbox onto a flat two dimensional plane. All six views are now
Figure 17-3The Glass Box Principle
visible at the same time as you can see in Figure 17-4. The six views are named Top, Front,Right Side, Left Side, Rear, and Bottom.
Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007 Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
17 - 2 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Figure 17-4The Glass Box Unfolded
The Three Standard ViewsIn almost all objects, three views areadequate to describe it. In fact, there aremany objects that only need two views andsome that only need one view to describeit. We will cover those later in themodules. For now, draw three views.
The three standard views are the Top,Front, and Right Side as shown in Figure17-5. They must be drawn in the positionshown and must line up as you will see onthe page 17-3.
Figure 17-5The Three Standard Views
Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007 Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Picking the ViewsThe three standard views are alwaysselected as shown in Figure 17-6.
Drawing the ViewsUsually it is best to draw the viewwith the most irregular shape firstand then project lines to the othertwo views. For the object in Figure17-6, the front view should be drawnfirst and then the top and right sideviews are projected.
Notice how the views have to line up.Figure 17-7 shows two differentmethods of projecting lines from thetop view to the right side view or viseversa. Use whichever method youprefer. Figure 17-6
Picking the Three Standard ViewsThe distance between views is not
17 - 3
important and can be easily moved using AutoCAD as you will see in later modules. In mostcases, adjust them to accommodate dimensions and notes.
Figure 17-7Two Methods for View Layout and Alignment
All students must pick the same top, front and right side views for an objectwhen drawing a multiview drawing of it. The views must be drawn in thecorrect position and must line up. The distance between is the views is notimportant.
Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007 Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
17 - 4 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Drafting LessonObject and Hidden Lines
Lines and features that can be seen in the views aredrawn with continuous or solid lines. They are calledobject lines. Even though they are called object lines, theycan be circular in shape. To completely describe anobject in a multiview drawing, you must also show all linesor features that are hidden in that view. They are calledhidden lines and their linetype is dashed. Study themultiview drawing below and take note how the holesgoing through the object are shown with hidden lines.
The Multiview Drawing
The Key Principles in Module 17
The Model
1. A three dimensional object drawn with two dimensional views is called a multiviewdrawing.
2. The three standard views of a multiview drawing are the top, front, and right side.
3. When drawing a multiview drawing, the top, front and right side views of an object mustbe drawn in the correct position and must line up. The distance between the views is notimportant.
Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007 Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12 17 - 5
Lab Exercise 17-1
Drawing Specifications
Time Allowed: 10 Min.
Name
N/A
Template
N/A
Units
N/A
Text Style
N/A
Font
N/A
Note: Color, Linetype, and Lineweight are all < ByLayer < unless otherwise instructed.
Layering Scheme
Objects on Layer Name Color Linetype LineweightN/A
Instructions:1. Using a pencil, sketch the top,
front and right side views of theobject shown below.
2. One grid on the model equals onegrid on the drawing. See theExample.
3. Check your answer on page 17-8.
N/A N/A N/A N/A
Do not look at the answer until youhave completed your sketch.
17-1-1
Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007
Example
Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
17 - 6 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
Lab Exercise 17-2
Drawing Specifications
Time Allowed: 40 Min
Name
N/A
Template
N/A
Units
N/A
Text Style
N/A
Font
N/A
Note: Color, Linetype, and Lineweight are all < ByLayer < unless otherwise instructed.
Layering Scheme
Objects on Layer Name Color Linetype LineweightN/A
Instructions:N/A N/A N/A
1. Using a pencil, sketch the top, front, and right side views of each model shown below.2. One grid on the model equals one grid on the drawing.3. Check your answers on page 17-8. Do not look at the answers until you have completed your
sketches.
17-2-1
17-2-2
Multiview Drawings The CAD Guys Ltd. Copyright © 1993 - 2007 Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
Multiview Drawings
AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
17-2-3
17-2-4
17-2-5
The CAD Guys Ltd. Copyright © 1993 - 2007
17 - 7
Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
17 - 8 AutoCAD Self-paced Learning Modules - AutoCAD 2D - Revised 2007-04-12
17-1-117-2-3
17-2-1 17-2-4
Multiview Drawings
17-2-2
The CAD Guys Ltd. Copyright © 1993 - 2007
17-2-5
Module 17
Click h
ere to
buy
ABB
YY PDF Transformer 2.0
www.ABBYY.comClic
k here
to buy
ABB
YY PDF Transformer 2.0
www.ABBYY.com
