Auto Cad Manual

COMPUTER AIDED DRAFTING AND MODELING

LABORATORY MANUAL

Prepared by,

R.PURUSHOTHAMAN, B.E.,

LECTURER/MECH

Name: ____________________________

Register no: ________________________

Degree/Branch: _____________________

Year/semester: ______________________

2 R.Purushothaman (Lecturer),

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GE6261COMPUTER AIDED DRAFTING AND MODELING LABORATORY L T P C

0 1 2 2

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 generalmulti-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(eg.

V-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.

10. Creation of 3-D models of simple objects and obtaining 2-D multi-view drawings from3-

D model.

Note: Plotting of drawings must be made for each exercise and attached to therecords

written by students.


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INDEX S.NO DATE NAME OF THE EXPERIMENT MARKS SIGNATURE

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.


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Auto CAD: AutoCAD is drafting/modeling software used all over the world by almost

allmanufacturing companies. It is variable software which can be used in allengineering

divisions. It is a drafting version popularly known to everyone associatedwith mechanical

engineering. The Autocad drawing enables the designer tocommunicate his ideas to the

outside of department easily.

START THE Auto CAD :

Start> programs>Autodesk>AutoCAD English-2012> AutoCAD English-2012

(or) Double click the icon on desktop.

START AND SAVE A DRAWING:

When you start a drawing, you specify the type of units and other settings youcan also

choose how to save your files, including saving back up files.The settings you select, English

a metric determines default values used formany system variables of controlling text

dimensions, grid, snap and default line typeand hatch pattern life.

ENGLISH - Creates a new drawing based on Imperial Measurement System.The drawing is

based on cad.dwt template. METRIC:

Creates a new drawing based on metric measurement.

The drawing is based on ocadiso.dwt template. Save drawing

files for later use.

UNITS

Every object is measured in units. In AutoCAD we

should select the insertion scale.

Enter the command: units

The drawing units dialogue box will appears.

Enter the details shown in image. LIMITS

The drawing limits are two-dimensional points in the

world coordinate thatrepresent a lower-left limit and an upper

right limit. You cannot impose limits on theZ direction.

Always use the A4 size as the limits.

Command: LIMITS

Specify lower left corner or [ON/OFF] :

Specify upper right corner :

ZOOM:

Command: ZOOM

Specify corner of window, enter a scale factor (nX or nXP), or

[All/Center/Dynamic/Extents/Previous/Scale/Window/Object] : a

Regenerating model.

Types of co-ordinate system:

Absolute co-ordinate system Relative coordinate system


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Relative polar co-ordinate system

Absolute co-ordinate system:

Command: LINE (or) L

Specify first point: 2,2

Specify next point or [Undo]: 52,2

Specify next point or [Undo]: 52,52 Specify next point or [Close/Undo]: 2,52

Specify next point or [Close/Undo]: 2,2

Relative coordinate system:

Command: LINE

Specify first point: p1 (you have need to be chosen)

Specify next point or [Undo]: @50,0


Specify next point or [Close/Undo]: @-50,0

Specify next point or [Close/Undo]: @0,-50

Relative polar co-ordinate system:

Command: LINE

Specify first point: p1 (you have need to be chosen)

Specify next point or [Undo]: @50


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3. Two point mode: Command: circle (or) C

Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 2p

Specify first end point of circle's diameter: p1

Specify second end point of circle's diameter: p2

4. Three point mode: Command: c

CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 3p

Specify first point on circle: p1

Specify second point on circle: p2

Specify third point on circle: p3

5. Tan tan radius mode: Command: c

CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: t

Specify point on object for first tangent of circle:p1

Specify point on object for second tangent of circle:p2

Specify radius of circle: (enter suitable value)

6. Tan tan tan mode: Go To Menu Bar-Draw-Circle-Tan, Tan, Tan

Command: _circle Specify center point for circle or [3P/2P/Ttr (tan tan

radius)]: _3p Specify first point on circle: _tan to

Specify second point on circle: p2

Specify third point on circle: p3

POLYGON

1. Edge polygon Command: POLYGON

Enter number of sides : 6

Specify center of polygon or [Edge]: e

Specify first endpoint of edge: p1

Specify second endpoint of edge: p2

2. Inscribed in circle polygon Command: POL

POLYGON Enter number of sides : 6

Specify center of polygon or [Edge]:p1

Enter an option [Inscribed in

circle/Circumscribed about circle] : I

Specify radius of circle: 30

3. Circumscribed about circle polygon Command: POL

POLYGON Enter number of sides : 6

Specify center of polygon or [Edge]:p1

Enter an option [Inscribed in circle/Circumscribed about circle] : c

Specify radius of circle: 30


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ARC: 1. Three point mode:

Command: A (or) arc

ARC Specify start point of arc or [Center]:p1

Specify second point of arc or [Center/End]:p2

Specify end point of arc:p3

2. Start center angle mode: Command: A

ARC Specify start point of arc or [Center]: 50,50

Specify second point of arc or [Center/End]: c

Specify center point of arc: 25,50

Specify end point of arc or [Angle/chord Length]: a

Specify included angle: 180

3. Star center end mode: Command: A

ARC Specify start point of arc or [Center]: 50, 50(p1)


Specify center point of arc: 25,50(p2)

Specify end point of arc or [Angle/chord Length]: 0,50(p3)

4. Star center length mode: Command: A



Specify center point of arc: 25,50

Specify end point of arc or [Angle/chord Length]: l

Specify length of chord: 50

5. Star end angle mode: Command: A


Specify second point of arc or [Center/End]: e

Specify end point of arc: 25,100

Specify center point of arc or [Angle/Direction/Radius]: a

Specify included angle: 90

6. Start end direction mode: Command: A




Specify center point of arc or [Angle/Direction/Radius]: d

Specify tangent direction for the start point of arc: 60,60(specify the

direction by cursor)

7. Star end radius mode:


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Command: A




Specify center point of arc or [Angle/Direction/Radius]: r

Specify radius of arc: 30

ELIPSE: 1. Giving the two end points of axis and other half distance which is equal to half of

the other axis

Command: ELLIPSE

Specify axis endpoint of ellipse or

[Arc/Center]: 50,50

Specify other endpoint of axis: 50,150

Specify distance to other axis or

[Rotation]: 10,10

2. Ellipse arc: Command: EL (or) ELLIPSE

Specify axis endpoint of ellipse or

[Arc/Center]: a

Specify axis endpoint of elliptical arc or [Center]:p1

Specify other endpoint of axis:p2

Specify distance to other axis or [p3Rotation]:

Specify start angle or [Parameter]:p4

Specify end angle or [Parameter/Included angle]:p5

MOVE:

Command: m

MOVE

Select objects: p1

Select objects: enter

Specify base point or [Displacement] :p2

Specify second point or :@20


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ERASE:

Selecting with regular window:

Command: E

ERASE

Select objects: w

Specify first corner: p1

Specify opposite corner: p2


OFFSET:

1. Offset distance: Command: o (or) OFFSET

Specify offset distance or [Through/Erase/Layer]

: 20

Select object to offset or [Exit/Undo] :p1

Specify point on side to offset or [Exit/Multiple/Undo]

:p2

Select object to offset or [Exit/Undo] : enter

2. Offset through: Command: o or OFFSET

Specify offset distance or [Through/Erase/Layer]

: t

Select object to offset or [Exit/Undo] :p1

Specify through point or [Exit/Multiple/Undo] :p2

Select object to offset or [Exit/Undo] : enter

ROTATE:

Command: RO or ROTATE

Select objects: p1


Specify base point: p2

Specify rotation angle or [Copy/Reference] : 90

SCALE:

Command: SC or scale

Select objects: p1

Select object: enter

Specify base point:p2

Specify scale factor or [Copy/Reference]: 2


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Before scale After scale

BREAK: Command: BR or BREAK

Select object:p1

Specify second break point or [First point]:p2

Before break After break

FILLET Command: F or FILLET

Current settings: Mode = TRIM, Radius = 0.0000

Select first object or [Undo/Polyline/Radius/Trim/Multiple]: r

Specify fillet radius : 10

Select first object or [Undo/Polyline/Radius/Trim/Multiple]:p1

Select second object or shift-select to apply corner or [Radius]:p2

Before fillet After fillet


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Chamfer:

1. Distance Command: CHA or CHAMFER

(TRIM mode) Current chamfer Dist1 = 0.0000, Dist2 = 0.0000

Select first line or [Undo/Polyline/Distance/Angle/Trim/mEthod/Multiple]: d

Specify first chamfer distance : 20

Specify second chamfer distance : 10

Select first line or [Undo/Polyline/Distance/Angle/Trim/mEthod/Multiple]:p1

Select second line or shift-select to apply corner or

[Distance/Angle/Method]:p2

Before chamfer After chamfer

2. Angle Command: CHA or CHAMFER

(TRIM mode) Current chamfer Dist1 = 0.0000, Dist2 = 0.0000

Select first line or [Undo/Polyline/Distance/Angle/Trim/method/Multiple]: a

Specify chamfer length on the first line : 20

Specify chamfer angle from the first line : 45

Select first line or [Undo/Polyline/Distance/Angle/Trim/method/Multiple]:p1

Select second line or shift-select to apply corner or Distance/Angle/Method]:

p2

After chamfer


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MIRROR:

Command: MI

MIRROR

Select objects: p1

Select objects: p2


Specify first point of mirror line:p3

Specify second point of mirror line:p4

Erase source objects? [Yes/No] : N or Y

Before mirror

Delete source object NO

Delete source object YES

ARRAY 1. Rectangular array

Draw the object

Command: ARRAY

Select objects: 1 found

Select objects:

Enter array type [Rectangular/PAth/POlar] : R

Type = Rectangular Associative = Yes

Specify opposite corner for number of items or [Base

point/Angle/Count]

: C

Enter number of rows or [Expression] : 4

Enter number of columns or [Expression] : 4

Specify opposite corner to space items or [Spacing] : S

Specify the distance between rows or [Expression] : 75


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Specify the distance between columns or [Expression] : 75

Press Enter to accept or [ASsociative/Base

point/Rows/Columns/Levels/eXit]: ENTER

Dimension disassociated.

2. POLAR ARRAY Command: ARRAY

Select objects: Specify opposite corner: 6 found

Select objects:

Enter array type [Rectangular/PAth/POlar] : po

Type = Polar Associative = Yes

Specify center point of array or [Base point/Axis of rotation]:

Enter number of items or [Angle between/Expression] : 6

Specify the angle to fill (+=ccw, -=cw) or [EXpression] :

Press Enter to accept or [ASsociative/Base point/Items/Angle between/Fill

angle/ROWs/Levels/ROTate items/eXit]:


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TRIM: Command: TR

TRIM

Current settings: Projection=UCS, Edge=None


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Select cutting edges...

Select objects or : p1

Select objects: p2


Select object to trim or shift-select to extend or

[Fence/Crossing/Project/Edge/eRase/Undo]:p1


[Fence/Crossing/Project/Edge/eRase/Undo]: Specify opposite corner:p2


[Fence/Crossing/Project/Edge/eRase/Undo]: Specify opposite corner: enter

Before trim After trim

TEXT:

1. Single line text Command: TEXT

Current text style: "Standard" Text height: 0.2000 Annotative: No

Specify start point of text or [Justify/Style]:

Specify height : 10

Specify rotation angle of text :

2. Multi text

Command: MT

MTEXT Current text style: "Standard" Text height: 10.0000 Annotative: No

Specify first corner:P1

Specify opposite corner or [Height/Justify/Line

spacing/Rotation/Style/Width/Columns]:P2

Enter the multi text:


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STRETCH Command: S

STRETCH

Select objects to stretch by crossing-window or crossing-polygon...

Select objects: Specify opposite corner: 1 found

Select objects:

Specify base point or [Displacement] :

Specify second point or :

Command: Specify opposite corner or [Fence/wpolygon/cpolygon]:

Before stretch After stretch


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FUNCTION OF AUTO CAD COMMANDS

Sl. No Commands Functions

1. ARC Creates an arc

2. ARRAY Creates multiple copies of objects in a pattern

3. BHATCH Fills an enclosed area or selected objects with a hatch pattern or

gradient fill

4. BLOCK Creates a block definition from objects you select

5. BREAK Breaks the selected object between two points

6. CHAMFER Bevels the edges of objects

7. CIRCLE Creates a circle

8. CLOSE Closes the current drawing

9. COPY Copies objects a specified distance in a specified direction

10. DIMSTYLE Creates and modifies dimension styles

11. DONUT Draws filled circles and rings

12. ELLIPSE Creates an ellipse or an elliptical arc

13. ERASE Removes objects from a drawing

14. EXPLODE Breaks a compound object into its component objects

15. EXPORT Saves objects to other file formats

16. EXTEND Extends an object to meet another object

17. FILLET Rounds and fillets the edges of objects

18. FIND Finds, replaces, selects, or zooms to specified text

19. GRID Displays a grid in the current viewport that is not plotted

20. HATCH Fills an enclosed area or selected objects with a hatch pattern, solid

fill, or gradient fill

21. HELP Displays Help

22. HIDE Regenerates a three-dimensional wireframe model with hidden lines

suppressed

23. IMPORT Imports files in various formats

24. ISOPLANE Specifies the current isometric plane

25. JOIN Joins objects to form a single, unbroken object

26. LAYER Manages layers and layer properties

27. LEADER Creates a line that connects annotation to a feature

28. LENGTHEN Changes the length of objects and the included angle of arcs

29. LIMITS Sets and controls the limits of the grid display in the current Model

or layout tab

30. LINE Creates straight line segments

31. LINETYPE Loads, sets, and modifies linetypes

32. LWEIGHT Sets the current lineweight, lineweight display options, and

lineweight units

33. MENU Loads a customization file

34. MIRROR Creates a mirror image copy of objects

35. MLINE Creates multiple parallel lines

36. MOVE Moves objects a specified distance in a specified direction

37. MTEXT Creates paragraphs of text as a single multiline text (mtext) object

38. NEW Creates a new drawing

39. OFFSET Creates concentric circles, parallel lines, and parallel curves

40. OOPS Restores erased objects

41. OPEN Opens an existing drawing file

42. ORTHO Constrains cursor movement to the horizontal or vertical direction


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43. OSNAP Sets running object snap modes

44. PAN Moves the view in the current viewport

45. POINT Creates a point object

46. POLYGON Creates an equilateral closed polyline

47. QUIT Exits the program

48. RECTANG Draws a rectangular polyline

49. REDO Reverses the effects of previous UNDO or U command

50. REDRAW Refreshes the display in the current viewport

51. REGEN Regenerates the entire drawing from the current viewport

52. REGION Converts an object that encloses an area into a region object

53. ROTATE Revolves objects around a base point

54. SAVE Saves the drawing under the current file name or a specified name

55. SAVEAS Saves a copy of the current drawing under a new file name

56. SPLINE Fits a smooth curve to a sequence of points within a specified

tolerance

57. SUBTRACT Combines selected regions or solids by subtraction

58. TABLE TABLE Creates an empty table object in a drawing

59. TEXT Creates a single-line text object

60. TRIM Trims objects at a cutting edge defined by other objects

61. U Reverses the most recent operation

62. UCS Manages user coordinate systems

63. UCSICON Controls the visibility and placement of the UCS icon

64. UNDO Reverses the effect of commands

65. UNITS Controls coordinate and angle display formats and precision

66. VIEW Saves and restores named views, camera views, layout views, and

preset views

67. XPLODE Breaks a compound object into its component objects

68. ZOOM Increases or decreases the apparent size of objects in the current

viewport

Function Keys and functions:

Function

Keys

Functions

F1 Displays Help

F2 Toggles Text Window

F3 Toggles OSNAP

F4 Toggles TABMODE

F5 Toggles ISOPLANE

F6 Toggles UCSDETECT

F7 Toggles GRIDMODE


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F8 Toggles ORTHOMODE

F9 Toggles SNAPMODE

F10 Toggles Polar Tracking

F11 Toggles Object Snap Tracking

F12 Toggles Dynamic Input

Shortcut Keys and functions:

Sl. No Shortcut Keys

Functions

1. ALT+F11 Displays the Visual Basic Editor

2. ALT+F8 Displays the Macros dialog box

3. CTRL+0 Toggles Clean Screen

4. CTRL+1 Toggles Properties palette

5. CTRL+2 Toggles DesignCenter

6. CTRL+3 Toggles the Tool Palettes window

7. CTRL+4 Toggles Sheet Set Manager

8. CTRL+6 Toggles dbConnect Manager

9. CTRL+7 Toggles Markup Set Manager

10. CTRL+8 Toggles the QuickCalc palette

11. CTRL+9 Toggles the Command Line window

12. CTRL+A Selects all the objects in drawing that are not

locked or frozen

13. CTRL+SHIFT+A Toggles Groups

14. CTRL+B Toggles Snap

15. CTRL+C Copies objects to the Windows Clipboard

16. CTRL+SHIFT+C Copies objects to the Windows Clipboard with

Base Point

17. CTRL+D Toggles Dynamic UCS

18. CTRL+E Cycles through isometric planes

19. CTRL+F Toggles running object snaps

20. CTRL+G Toggles Grid


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21. CTRL+H Toggles PICKSTYLE

22. CTRL+SHIFT+H Toggles the display of palettes with

HIDEPALETTES and SHOWPALETTES

23. CTRL+I Toggles the Coordinates display

24. CTRL+J Repeats last command

25. CTRL+K Inserts a hyperlink

26. CTRL+L Toggles Ortho mode

27. CTRL+M Repeats last command

28. CTRL+N Creates a new drawing

29. CTRL+O Opens an existing drawing

30. CTRL+P Plots the current drawing

31. CTRL+SHIFT+P Toggles the Quick Properties interface

32. CTRL+Q Quits AutoCAD

33. CTRL+R Cycles through the viewports on the current

layout

34. CTRL+S Saves current drawing

35. CTRL+SHIFT+S Displays up the Save As dialog box

36. CTRL+T Toggles Tablet mode

37. CTRL+V Pastes data from the Windows Clipboard

38. CTRL+SHIFT+V Pastes data from the Windows Clipboard as a

Block

39. CTRL+X Cuts objects from the current drawing to the

Windows Clipboard

40. CTRL+Y Cancels the preceding Undo action

41. CTRL+Z Reverses the last action

42. CTRL+[ Cancels current command

43. CTRL+\ Cancels current command

44. CTRL+PAGE UP Moves to the next layout tab to the left of the

current tab

45. CTRL+PAGE DOWN Moves to the next layout tab to the right of the

current tab


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TITLE BLOCK WITH NECESSARY TEXT AND PROJECTION SYMBOL

Aim:

To draw a title block with necessary text and projection symbol on A3 size sheet of

420 X 297 mm using AutoCAD.

Software Used: Auto CAD 2012

Commands Used:

Limits, Zoom, Line, Circle, Offset, Copy, Move, Trim, Layer, DIM,Text.

Procedure:

1) Limits are set for A3 standard drawing size.

2) Using appropriate commands the title block was drawn as per the dimensions.

3) By using text command the required texts are created in the title box.

4) Drawn title block is dimensioned accordingly.

5) Finished work sheet is saved and hard copy is taken.

Result:

Thus the title block with necessary text and projection symbol of a title block on A3

sheet was drawn using AutoCAD.

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Draw the orthographic projections (top view, front view, side view)


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ORTHOGRAPHIC VIEW

Aim:

To draw the orthographic views from the given object using Auto CAD

software.


Commands Used:

Limits, Zoom, Line, Polygon, Arc, Circle, Offset, Copy, Move, Trim, Layer, DIM.

Procedure:


2) Using appropriate commands, front, top and Left side view of given solids are drawn.

3) Layer is defined (for line type, line weight and colour) separately for visible, hidden, axis

and dimension lines and applied.

4) Drawn views were dimensioned accordingly.


Result:

The orthographic views of the given solids are drawn using Auto CAD.

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Draw the isometric view of given views

All dimensions are in mm


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ISOMETRIC VIEWS OF THE 2D VIEWS

Aim:

To draw the isometric view of given simple solids and objects using Auto CAD

software.


Commands Used:

Limits, Zoom, Line, Polygon, Arc, Circle, Offset, Copy, Move, Trim, Layer, DIM,

Mtext,UCS.

Procedure:


2) Using Line, Circle, Polygon commands, front and top view of given simple solids are

drawn.

3) Snap is changed from Rectangular to Isometric to help draw the Isometric view. F5 key is

used to invoke/toggle between the different Isoplanes (Left, Top, Right) accordingly.

4) Given objects are taken and drawn in Isometric.

5) Drawn solids are named and dimensioned accordingly.


Result:

The Isometric view of the given simple solids and objects are drawn using Auto CAD.

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All dimensions are in mm


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ISOMETRIC VIEW OF THE GIVEN 3D OBJECT

Aim:

To draw the isometric view of given object using Auto CAD software.


Commands Used:

Limits, Zoom, Line, Polygon, Arc, Circle, Offset, Copy, Move, Trim, Layer, DIM, Mtext,

UCS.

Procedure:


2) Using Line, Circle, Polygon commands, front and top view of given simple solids are

drawn.

3) Snap is changed from Rectangular to Isometric to help draw the Isometric view. F5 key is

used to invoke/toggle between the different Isoplanes (Left, Top, Right) accordingly.

4) Given objects are taken and drawn in Isometric.

5) Drawn solids are named and dimensioned accordingly.


Result:

The Isometric viewof the given object was drawn using Auto CAD.

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SQUARE INVOLUTE

AIM:

To draw a square involute of 30 mm side using AutoCAD.

SOFTWARE USED:

AutoCAD 2012

PROCEDURE:

Initially the AutoCAD software is opened by using the command start-

programs-auto desk- AutoCAD English 2012- AutoCAD English 2012.

By using the following commands the square involute were executed.

Command: LIMITS

Specify lower left corner or [ON/OFF] :

Specify upper right corner : 200,200

Command: ZOOM

Specify corner of window, enter a scale factor (nX or nXP), or

[All/Center/Dynamic/Extents/Previous/Scale/Window/Object] : a

Command: REC

RECTANG

Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]:P2

Specify other corner point or [Area/Dimensions/Rotation]: @30,30

Command: LINE

Specify first point:P2

Specify next point or [Undo]: @0,-30

Specify next point or [Undo]:

Command: LINE

Specify first point:P3

Specify next point or [Undo]: @-60,0


Command: l

LINE Specify first point:P4



Command:l

LINE Specify first point:P1



Command: ARC

Specify start point of arc or [Center]:Q2


Specify end point of arc:P1

Specify center point of arc or [Angle/Direction/Radius]:P2

Command: arc



Specify end point of arc:Q2


Command: arc

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Command: a

ARC Specify start point of arc or [Center]:Q1




Result:

Thus the square involute was drawn successfully by using AutoCAD 2012.


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RESIDENTIAL BUILDING


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PLAN OF RESIDENTIAL BUILDING

Aim:

To create the plan of given residential building using Auto CAD software.


Commands Used:

Limits, Zoom, Line, Offset, Copy, Move, Multiline.

Procedure:

1) Limits are set for 420X 297 size.

2) Using Multiline command, plan of the given residential building is drawn.

3) The plan is dimensioned and the rooms are named accordingly.


Result:

Thus the plan of the given residential building is drawn using Auto CAD.

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TRUSS

AIM:

To create the simple steel truss using the AutoCAD 2012.


Commands Used:

Limits, Zoom, Line, Offset, Copy, Move, Multiline, Trim, mirror.

Procedure:

1) Limits are set for A4 standard drawing size

2) Using line, mirror, offset commands the required truss was drawn.

3) The dimensions were marked by using dimlinear command.

4) Finally finished work sheet is saved and hard copy is taken.

Result:

Thus the steel truss element was drawn using Auto CAD.

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DRAWING OF 3D MODELS AND OBTAINING MULTIVIEWS

AIM:

To draw the 3D model and obtaining the multiviews by using AutoCAD.


Commands Used:

Limits, Zoom, Line, Offset, Copy, Move, Multiline, Trim, mirror, Revolve, Dim.

Procedure:

1) Limits are set for 420x 297 sizes.

2) Using line and arc comments the 2d diagram was drawn.

3) After obtaining the 2d element by using the revolve command the object was

revolved.

4) Finally the 3d model was obtained as per our requirement.


RESULT:

Thus the 3d model and multiviews were obtained successfully using AutoCAD.

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SECTION PLANE

Aim:

To draw the sectional view of the prism using autocad.

Software Used:

Auto CAD 2012

Commands Used:

Limits, zoom, Polygon, extrude, sectionplane.

Procedure:

1) Limits are set for 420x 297 sizes

2) The hexagon was drawn by using the polygon command.

3) It was extruded by using extrude command the height of 100 mm.

4) Entering the sectionplane command and choosing the front view of the

object the cutting action is done.

5) Generally it cuts at the axis of the prism it moves by offsetting the section

plane position into 20mm away from it.


Result:

Thus the sectional view of the prism was obtained successfully by using

AutoCAD.

EXPT NO: DATE:


KSKCET/MECH

SECTION OF SOLIDS

A cylinder 60 mm diameter and 80 mm long stands with its circular base

on HP.A section plane perpendicular to VP and inclined at 60 to HP cuts the

axis at a point 28 mm from its top end. Draw the sectional views and the true

shape of section. Insert dimensions suitably

AIM:

To draw the sectional view of the cylinder using AutoCAD.

Software Used:

Auto CAD 2012

Commands Used:

Limits, Zoom, Line, Offset, Copy, Move, Multiline, Trim, Hatch.

Procedure:

1) Limits are set for 420x 297 sizes

2) The reference plane xy was drawn

3) Front and top view of the cylinder was sketched on the AutoCAD window.

4) Section plane was inserted by using line command based on the dimension

5) Finally the section view is viewed by hatching the cutting surfaces.

6) Dimensions are marked suitably.


Result:

Thus the sectional view of the cylinder was obtained successfully by using

AutoCAD.

EXPT NO: DATE:


KSKCET/MECH

EXTRA QUESTIONS PRACTICE

1. i) Trace the different conic sections when the distance of the focus from the directrix is 30

mm and eccentricity is : i) equal to 7/9, ii) equal to 1 and iii) equal to 9/7. Name the curves.

ii) A shot is discharged from the ground level at an inclination of 50o to the ground which is

assumed to be horizontal. The shot returns to the ground at a point 80 m distant from the

point of discharge. Trace the path of the shot. Take suitable scale.

2. i) Draw the involute of a pentagon of 20 mm side.

ii) Draw the involute of a circle of diameter 40 mm. Also draw a tangent and normal at any

point on the curve.

3. Construct an Archimedean spiral for one convolution. The initial and final radius vectors

are 25 mm and 100 mm respectively. Draw a tangent and the normal to the spiral at a point

50 mm from the pole.

4. Draw the projections of a pentagonal prism 20 mm side of base and axis 40 mm long

resting on a corner such that the two base edges passing through it make equal inclinations

with HP and its base is inclined at 60o to HP, and the axis appears to be inclined at 30o to

the VP in the top view. Insert dimensions suitably.

5. A hexagonal prism base 20 mm side and axis 40 mm long is placed with one of its base

edges on HP such that the axis is inclined at 30o to HP and 45o to VP. Draw its projections.

Insert dimensions suitably.

6. A pentagonal pyramid 20 mm side of base and axis 35 mm long rests with one of its

corners on HP such that the two base edges passing through the corner on which it rests

make equal inclination with HP. The axis is inclined at 45o to VP and 30o to the HP. Draw

the top and front views of the pyramid. Insert dimensions suitably.

7. A hexagonal pyramid, base 30 mm side and axis 60 mm long has one of its slant edges on

HP such that two of its triangular faces containing the slant edge on which it rests are

equally inclined to HP. The top view of the axis appears to be inclined at 45o to VP. Draw

its projections when its base is nearer to the observer than its apex. Insert dimensions

suitably.

8. A cone of base 80 mm diameter and height 100 mm is lying with one of its generators on

HP and the axis appears to be inclined to the VP at an angle of 40o in the top view. Draw

its top and front views. Insert dimensions suitably.

9. Draw the top and front views of a right circular cylinder of base 45 mm diameter and 60

mm long when it lies on HP, such that its axis is inclined at 30o to HP and the axis appears

to be perpendicular to the VP in the top view. Insert dimensions suitably.

10. A hexagonal headed bolt without chamfer is 30 mm in diameter and cylindrical portion is

65 mm long. The sides of the faces of the hexagonal head are 30 mm in length and the

thickness of the hexagonal head is 25 mm. The bolt is placed with horizontal edge of the

head on ground such that it is perpendicular to VP and the axis of the bolt is inclined at 30o

to HP. Draw the top and front views of the bolt. Insert dimensions suitably.


KSKCET/MECH

11. For 30 feet X 40 feet (9.144 m X 12.19 m) land area is to be constructed by leaving 2 feet

(0.609 m) space at all four sides. And in the remaining area a house is to be constructed with

2 nos of bed rooms, kitchen and 2 nos of bath cum toilet one attaching to bed room and other as common. Draw the plan for this residential house.

12. For 40 feet X 40 feet (12.19 m X 12.19 m) land area is to be constructed by leaving 2 feet

(0.609 m) space at all four sides. And in the remaining area a house is to be constructed with

3 nos of bed rooms, kitchen and 3 nos of bath cum toilet each attaching to bed room. Draw plan for this residential house.

13. A hexagonal pyramid 25 mm edge of base and axis 65 mm lies with a triangular face on

HP and the axis parallel to VP. A section plane perpendicular to HP and inclined at 30o to

VP bisects the axis of the pyramid. Draw the sectional front view and true shape of section.

Insert dimensions suitably.

14. A cylinder 60 mm diameter and 80 mm long stands with its circular base on HP.A section

plane perpendicular to VP and inclined at 60o to HP cuts the axis at a point 28 mm from its

top end. Draw the sectional top and right views and the true shape of section. Insert

dimensions suitably.

15. A cone diameter of base 60 mm and axis 70 mm long is resting on its base on HP. It is cut

by a section plane perpendicular to VP and inclined at 45o to HP. The vertical trace of the

section plane passes through the axis at a point 40 mm above HP. Draw the sectional top

view, front view and the true shape of section. Insert dimensions suitably.

16. A cube of 30 mm edges is cut by a section plane so that the true shape of section is a

regular hexagon. Draw the projections of the cube and find the inclination of the section

plane with HP. Also measure the length of the sides of the regular hexagon in the true shape

of section. Insert dimensions suitably.

17. Draw a hexagonal prism, has a face on the ground and the axis parallel to the V.P. It is cut

by a vertical section plane, the H.T. of which makes an angle 45o with xy and which cuts the

axis at a point 20 mm from one of its ends. Draw the sectional front view and the true shape

of the section. Side of base 25 mm long, height 65 mm. Insert dimensions suitably.

18. A pentagonal pyramid, base 30 mm side and axis 65 mm long, has its base horizontal and

an edge of the base parallel to the V.P. A horizontal section plane cuts it at a distance of 25

mm above the base. Draw its front view and sectional top view. Insert dimensions suitably.

19.A cylinder of 40 mm diameter, 60 mm height and having its axis vertical, is cut by a

section plane, perpendicular to the V.P., inclined at 45o to the H.P. and intersecting the axis

32 mm above the base. Draw its front view, sectional top view, sectional side view and true

shape of the section. Insert dimensions suitably.

20.A cone, diameter of base 50 mm and a axis 50 mm long is resting on its base on the

ground. It is cut by a section plane perpendicular to the V.P., inclined at 75o to the H.P. and

passing through the apex. Draw its front view, sectional top view and true shape of the

section. Insert dimensions suitably.

Documents

Auto Cad Manual