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A MANUAL OF

PREPARED BY

R.HARISUDHANLECTURER/MECHANICALTHE KAVERY ENGINEERING COLLEGE

DEPARTMENT OF

MECHANICAL

ENGINEERING

COMPUTER AIDED DRAFTING AND MODELING LABORATORY

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S.NO

DATE TITLE OF THE EXPERIMENTMARK

SREMARKS

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TOTAL MARKS:

SYLLABUS

080120008 COMPUTER AIDED DRAFTING AND MODELING LABORATORY

List of Exercises using software capable of Drafting and Modeling

1. Study of capabilities of software for Drafting and Modeling –Coordinate Systems

(absolute, relative, Polar, etc.) – Creation of simple figures like polygon and general

multi-Line figures.

2. Drawing of a Title Block with necessary text and projection symbol.

3. Drawing of curves like parabola, spiral, involute using Bspline or cubic spline.

4. Drawing of front view and top view of simple solids like prism, pyramid, cylinder,

cone, etc, and dimensioning.

5. Drawing front view, top view and side view of objects from the given pictorial

views (e.g.-block, Base of a mixie, Simple stool, Objects with hole and curves).

6. Drawing of a plan of residential building (Two bed rooms, kitchen, hall, etc.)

7. Drawing of a simple steel truss.

8. Drawing sectional views of prism, pyramid, cylinder, cone, etc,

9. Drawing isometric projection of simple objects.

I0. Creation of 3-D models of simple objects and obtaining 2-D multi-view drawings

from 3-D model.

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Methods of indicating dimensions:

1) Unidirectional system2) Aligned system

Unidirectional system:

In this method, the dimensions shall be horizontally placed so that they can be read from the bottom of the drawing sheet. The dimension values are interrupted to their dimension lines and are preferably.

Aligned system:

In this method, the dimensions shall be horizontally placed parallel to and above the dimension lines. They are preferably in the middle and not by interrupting the dimension line. Here the dimension can be read from the bottom (or) from the right side of the drawings.

Methods of dimensions:

(a) Chain dimensioning(b) Parallel Dimensioning.

Some of the Dimensioning Rules:

i. Arrow heads must touch the extension line.

ii. Location of holes should be dimensioned in the TOP VIEWS.

iii. Arrange the series of dimensions on a continuous line.

iv. Keep the dimensions outside of the drawings.

v. Always place a longer dimension outside a shorter one.

vi. Always place the angles outside the views of an object.

vii. Dimension lines should be spaced uniformly.

viii. Dimension lines should not touch the object. About 1.5mm gap should be

allowed.

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Ex. No : 1Date :

CO-ORDINATE SYSTEMS

AIM:

To study about various co ordinate systems and to create simple figures like polygon, multiline figures, etc.

SOFTWARE USED:

Solid edge V20

DESCRIPTION:

Absolute coordinate system:-

Absolute coordinate systems are based on the UCS origin (0, 0) which is the intersection of

the X and Y axes. Use absolute coordinate when you know the precise X and Y value of the point.

Format:-

(Value of X, value of Y)

Relative coordinate system:-

Relative Co-Ordinates are based on the last point entered. Use relative co-ordinates when you

know the location of a point in relation to the previous point. To specify relative co-ordinates,

precedes the co-ordinate with a @ sign.

Format:-

@ (change in X, change in of Y)

Polar coordinate system:-

To use polar co-ordinates we have to specify a point, enter a distance and an angle separated

by an angle bracket (<)

Format:-

(Distance of line < angle of that line)

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PROCEDURE:

1. Create a separate Directory for this drawing.

2. Make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and

remove the background also.

3. We have to chosen the “N-Sided Polygon” from “Run macros”

4. It shows dialog box. There are three options in the definition type from that we choose any

one of option.

5. Then to enter the value of “Flat Length” (i.e. 20mm) and number of polygon (no of sides: 6).

6. Wherever we want to click the polygon in the sheet.

7. Then save the file in the desired Directory.

RESULT:

Thus the various co-ordinate systems have been studied and simple figures like polygon and multi line objects are created.

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Ex. No: 2 TITLE BLOCKDate :

AIM:To draw the specified title block with necessary text and projection symbol.

SOFTWARE USED:Solid edge V20

DESCRIPTION:

Title Block:

It is an important feature in the drawing. It should be placed at right hand bottom corner of

the sheet. The IS: 11665-1983 code gives the specification for the title block. The main

information is given in the title block by means of one or more rectangle and the rectangle may

be sub-divided into smaller boxes for providing specific information’s.

These rectangles are classified into,

1) Identification zone

2) Other zone (for additional information)

3) Identification zone gives the basic information about

a. Registration or Identification numbers

b. Title of the Drawing

c. Name of the legal owners of the Drawing

DRAWING OF TITLE BLOCK:

PROCEDURE:

1. Create a separate Directory for this drawing.

2. Make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and

remove the background also.

3. Select “Fit” command is used to refit the sheet to fully display it on the Screen.

4. Draw the rectangular by using the command such as line, offset, etc...

5. Create a title block for given dimension and type the text inside the block

Using text commands.

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6. Create the projection symbol by using the tool like line, circle, and centre line.

7. After completing the title block, to mention the dimension by using “smart

Dimension” and “distance between” dimension.

8. Then save the file in the desired Directory.

RESULT:

Thus standard Title blocks with specified dimensions along with projection symbols have

been drawn.

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Ex. No: 3 DRAWING OF CURVESDate :

AIM:Drawings of various curves like parabola, spiral, and involutes using spline or cubic spline

command.

SOFTWARE USED:Solid edge V20

PROCEDURE:

Steps in Drawing of Spiral:

1. Create a separate Directory for this drawing.

2. Make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and

remove the background also.

3. Select “Fit” command is used to refit the sheet to fully display it on the Screen.

4. By using the “line” option we have to make a square spiral with an increasing length.

5. Then choose the option “convert to curve “which is given in window.

6. This option is for to convert the selection by three points to select all the line drawn.

7. After selection we can drag to the required range from the centre point of the all line

Steps in Drawing of parabola:

1. Draw a centre line using straight line of 150 mm.

2. Make a perpendicular line to its centre of length 75 mm.

3. Then by using the option “curve” draws a curve which connects all three points of

perpendicular line.

4. Mention the dimension by using “smart Dimension” and “distance between“

dimensions.

Steps in Drawing of involutes:

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1. Draw a circle of 50 mm diameter using the option “circle by centre”

2. Make 4 radiuses in the circle of 45˚ difference.

3. Use the option “Extent to Next” to make diameter.

4. Draw tangent to the circle

5. By using the option specified “Arc by centre” we have to draw involute for drawn circle.

6. Then save the file in the folder we created.

RESULT:

Thus the various curves like parabola, spiral and involutes have been drawn using spline

command.

Ex. No : 4 DRAWING OF SIMPLE SOLIDSDate :

AIM:

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To draw the front view and top view of simple solids like prism, pyramid, cylinder, cone, etc, and dimensioning.

SOFTWARE USED:Solid edge V20

CONSTRUCTION OF CONE:

PROCEDURE:

Drawing of front view of cone (Triangle)

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. Draw the front of cone by using “line” command at required size

Drawing of top view of cone (Triangle)

1. To draw the top of cone by using “circle” command at required size.

CONSTRUCTION OF PYRAMID:

PROCEDURE:

Drawing of top view of hexagonal pyramid

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. Draw the top of pyramid by using “N-Sided polygon” command at required size

4. For this to mention the flat length and no of sides drawing of front view of hexagonal pyramid

5. Draw the front view of pyramid by using “line” command.

CONSTRUCTION OF CYLINDER:

PROCEDURE:

Drawing of front view of Cylinder

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1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. Draw the front of cylinder by using “line” command at required size

Drawing of top view of cone (Triangle)

1. To draw the top of the cylinder by using “circle” command at required size.

CONSTRUCTION OF HEXAGONAL PRISM:

PROCEDURE:

Drawing of front view of Hexagonal prism

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. To draw the front of Hexagonal prism by using “line” command at required size

Drawing of top view of Hexagonal prism

1. To draw the top of Hexagonal prism by using “circle” command at required size.

RESULT:

Thus the drawing of front view and top view of simple solids like prism, pyramid, cylinder, cone, etc, and dimensioning have been created.

Ex. No : 5 ORTHOGRAPHIC PROJECTION OF SIMPLE MODELSDate :

AIM:

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To draw the front view, top view and side of simple objects from given pictorial views. (E.g.-block, base of a mixie, simple stool, object with holes and curves)

PROCEDURE:

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. We should be taken as the front view of the arrow mark side from the given pictorial

view4. Draw the front view side and top view by using the tools like “line”, “rectangle”.

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RESULT:

Thus the drawings of front view top view and side view of the given object with required dimensions have been created.

Ex. No : 6 DRAWING OF A PLAN OF RESIDENTIAL BUILDINGDate :

AIM:

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To draw the plan of residential building with two bed rooms, kitchen, hall etc.With required dimensions.

PROCEDURE:

1. Set the units in feet inches by using file properties.

2. Then to go to sheet setup to change the units in inches by using paper units then click the custom for entering the maximum size of width and height.

3. “Fit” command is used to refit the sheet to fully display it on the screen.

4. Draw the plan of residential building drawing by using tools like “line”

“Rectangle”, “offset”. “Trim”

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RESULT:

Thus the plan of a residential building with two bed rooms, kitchen, and hall etc.With required dimensions have been created.

Ex. No: 7 THE STEEL TRUSSDate :

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AIM:To draw a simple steel truss for the given dimensions.

PROCEDURE:

1. Set the units in feet inches file properties.

2. Then to go to sheet setup to change the units in inches by using paper unit then click the custom for entering the maximum size of width and height

3. “Fit” command is used to fit the sheet to fully display it on the screen.

4. Draw the steel truss drawing by using tools like “line”

5. “Rectangle”, “offset”.”trim”

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RESULT:

Thus the simple steel truss for given dimensions have been created.

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Ex. No : 8 SECTIONAL VIEWS OF SOLIDSDate :

AIM:To draw sectional views of simple solids for the given dimensions.

SOFTWARE USED:Solid edge V20

CONSTRUCTION OF CONE:

PROCEDURE:

Drawing of front view of cone (Triangle)

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. draw the front of cone by using “line” command at required size4. specify the hatching area only cutting portion of object

Drawing of top view of cone (Triangle)

1. Draw the top of cone by using “circle” command at required size

2. Cut the portion of object by using cutting plane.

CONSTRUCTION OF CYLINDER:

PROCEDURE:

Drawing of front view of Cylinder

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. draw the front of cylinder by using “line” command at required size4. specify the hatching area only cutting portion of object

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Drawing of top view of cone (Triangle)

1. Draw the top of cylinder by using “circle” command at required size.

2. Cut the portion of object by using cutting plane.

CONSTRUCTION OF PYRAMID:

PROCEDURE:

Drawing of top view of hexagonal pyramid

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. Draw the top of pyramid by using “N-Sided polygon” command at required size4. Specify the hatching area only cutting portion of object

For this to mention the flat length and no of sides drawing of front view of hexagonal pyramid

1. Draw the front view of pyramid by using “line” command.

2. Cut the portion of object by using cutting plane.

CONSTRUCTION OF HEXAGONAL PRISM:

PROCEDURE:

Drawing of front view of Hexagonal prism

1. First we have to make sheet setup by the option “sheet setup” and choose specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.3. Draw the front of Hexagonal prism by using “line” command at required size4. Specify the hatching area only cutting portion of object

Drawing of top view of Hexagonal prism

1. Draw the top of Hexagonal prism by using “circle” command at required size.

2. Cut the portion of object by using cutting plane

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RESULT:

Thus the sectional views of simple solids for the given dimensions have been created.

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Ex. No 9 ISOMETRIC PROJECTIONS OF SOLIDSDate :

AIM:To draw the Orthographic views of simple objects from the given Isometric object.

PROCEDURE:

1. First we have to make sheet setup by the option “sheet setup” and choose

specification “A4 Sheet” and remove the background also.

2. “Fit” command is used to refit the sheet to fully display it on the screen.

3. Draw the block by using polar method with the help of specifying the distance and

angle.

4. Finally to complete the isometric drawing with help of polar method.

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RESULT:

Thus the Isometric projections of simple objects from the given Orthographic views have been created.

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Ex. No : 10 CREATION OF 3-D MODELS AND OBTAINING Date : 2-D MULTIVIEW DRAWINGS

AIM:To create 3-D models of given simple object and obtaining 2-D multi-view drawings from 3-D model.

PROCEDURE:

1. Select the solid module from the different module.2. Set the units in mm by using file properties.3. Draw any cross sectional view at any specified plane to create a feature which protrudes from

the cross sectional views4. Protrusion takes place perpendicular to the plane.5. Protrusion extends two methods

(i) Symmetrical extend(ii) Un symmetrical extend

6. It extend the feature equally in opposite direction by protrusion symmetrical extend7. It extend the feature unequally opposite direction by protrusion unsymmetrical extend.8. In cutout tool which are used to removes a defined portion of the part.9. Draw the cross section of an object on any one of the surface. Which it is extend the object,

cut will be take place inside of the object.10. After completion of model it will be saved in one file by using save as command.11. Then go to create drawing it will shows drawing view creation wizard dialog box.12. Select any view (front, side and top). It shows drawing view layout and then to click the

finish command.13. Front view will be displayed on the sheet.14. Finally to click the principal view and get the all projection views.

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RESULT:

Thus the Creation of 3-D models of simple objects and obtaining 2-D multi-view drawings from 3-D model have been created.

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