This presentation contains AutoCAD 2D commands for creating machine drawing using DRAW, MODIFY, ANNOTATION, PROPERTIES, LAYER commands, this also contains how to take a print in Autocad.

1. Computer Aided Machine Drawing
3331906
Tarun B Patel
Mech Dept
Dr Ghandhy College,Surat

2. Outline
• Introduction of CAD
• Syllabus
• Introduction of Autocad
• User interface
• Draw commands
• Edit commands
• Dimensions
TARUN B PATEL MECHANICAL DEPT

3. Objectives
• Select appropriate computer system according
to requirement of CAD software.
• Create 2D mechanical drawing using
parametric and non-parametric modelling
techniques with specified standard.
• Build Assembly drawing of mechanical part
using AUTOCAD.
TARUN B PATEL MECHANICAL DEPT

4. Introduction of CAD
• CAD
• Need
• Software for CAD
TARUN B PATEL MECHANICAL DEPT

5. Autocad interface
• 1.pdf
• 2.pdf
• 3.pdf
• autocad guide.pdf
TARUN B PATEL MECHANICAL DEPT

6. Autocad Installation
• Autocad educational version
– https://www.autodesk.com/education/free-
software/autocad
• Autocad mobile App
– https://www.youtube.com/watch?v=n-0L-
ym_qCo&t=43s
TARUN B PATEL MECHANICAL DEPT

7. AutoCAD Coordinates System
• Absolute coordinates
• Relative coordinates
• Polar coordinates.
Absolute Coordinates
All input points specify in your drawing
using standard Cartesian coordinates x
and y. Using absolute coordinate, points
entered by typing x,y [Enter]
Enter LINE command: L [Enter]
Start line at point A: 0,0 [Enter]
End first line at point B: 2,2 [Enter]
End of second line at point C: 2,3 [Enter]
TARUN B PATEL MECHANICAL DEPT

8. Conti…
Relative Coordinates
After first points entered, your next points can
be entered by specifying the next coordinate
compare/relative from the first points. The
relative coordinate started with symbol “@”
tell AutoCAD it was a relative coordinates.
Using relative coordinate, points entered by
typing @x,y [Enter]
Enter LINE command: L [Enter]
Start line at point A: 0,0 [Enter]
End first line at point B: @2,2 [Enter]
End of second line at point C: @0,1 [Enter]
TARUN B PATEL MECHANICAL DEPT

9. Conti…
Polar Coordinates
Polar coordinates used when you need to draw
the next points at specify angle. Polar
coordinates system in AutoCAD specifies
distance length at which angle. Using polar
coordinate, points entered by typing
@distance<angle [Enter]
Enter LINE command: L [Enter]
Start line at point A: 0,0 [Enter]
End first line at point B: @2.828<45 [Enter]
End of second line at point C: @1<90 [Enter]TARUN B PATEL MECHANICAL DEPT

10. Geometry Using Absolute Co.
POINT Absolute Coordinate
2
3
4
5
6
7
8
1
1 2
3 4
5 6
78
30,10
30,25
60,25
60,10
80,10
80,60
10,60
10,10
By Using Line Command
TARUN B PATEL MECHANICAL DEPT

11. Geometry Using Relative Co.
POINT Relative Coordinate
2
3
4
5
6
7
8
1
1 2
3 4
5 6
78
@20,00
@00,15
@30,00
@00,-15
@20,00
@00,50
@-70,00
@00,-50
Specify first pt 1 (10,10)
By Using Line Command
TARUN B PATEL MECHANICAL DEPT

12. Geometry Using Polar Relative Co.
POINT Polar Coordinate
2
3
4
5
6
7
8
1
1 2
3 4
5 6
78
@20<00
@15<90
@30<00
@15<270
@20<00
@50<90
@70,180
@50<270
Specify first pt 1 (10,10)
By Using Line Command
TARUN B PATEL MECHANICAL DEPT

13. Your Work
• Find the Coordinates for
the given Figure 2 by
using Absolute, Relative
& Polar Coordinate???
FIGURE 2
TARUN B PATEL MECHANICAL DEPT

14. Your Work
• Find the Coordinates for
the given Figure 1 by
using Absolute, Relative
& Polar Coordinate???
FIGURE 1
TARUN B PATEL MECHANICAL DEPT

15. Autocad Draw Commands
• LINE
• CIRCLE
• POLYLINE
• ARC
• RECTANGLE
• ELLIPSE
• HATCH
TARUN B PATEL MECHANICAL DEPT

16. LINE
• The line is the most basic and common object in AutoCAD
drawings. To draw a line, click the Line tool.
Select line ICON
Use command bar
TARUN B PATEL MECHANICAL DEPT

17. 1
Absolute Coordinate method
Command : Line [enter]
LINE Specify the First point : (pt1)50,50
[enter]
Specify the next point:(pt2)90,50 [enter]
Specify the next point:(pt3)120,80[enter]
Specify the next point:(pt4)120,120 [enter]
Specify the next point:(pt5)90,150 [enter]
Specify the next point:(pt6)50,150 [enter]
Specify the next point:(pt7)20,120 [enter]
Specify the next point:(pt8)20,80 [enter]
Specify the next point:(pt1)50,50 [enter]
2
3
4
56
7
8
TARUN B PATEL MECHANICAL DEPT

18. 1
Relative Coordinate method
Command : Line [enter]
LINE Specify the First point : (pt1)50,50
[enter]
Specify the next point:(pt2)@40,00 [enter]
Specify the next point:(pt3)@30,30[enter]
Specify the next point:(pt4)@00,40 [enter]
Specify the next point:(pt5)@-30,30 [enter]
Specify the next point:(pt6)@-40,00 [enter]
Specify the next point:(pt7)@-30,-30 [enter]
Specify the next point:(pt8)@00,-40 [enter]
Specify the next point:(pt1)@30,-30[enter]
2
3
4
56
7
8
TARUN B PATEL MECHANICAL DEPT

19. 1
Polar Coordinate method
Command : Line [enter]
LINE Specify the First point : (pt1)50,50
[enter]
Specify the next point:(pt2)@40<00 [enter]
Specify the next point:(pt3)@42<45[enter]
Specify the next point:(pt4)@40<90 [enter]
Specify the next point:(pt5)@42<135[enter]
Specify the next point:(pt6)@40<180 [enter]
Specify the next point:(pt7)@42<225[enter]
Specify the next point:(pt8)@40<270[enter]
Specify the next point:(pt1)@42<315[enter]
2
3
4
56
7
8
TARUN B PATEL MECHANICAL DEPT

20. Circle com…
• Circle command is used to draw circle by giving
following inputs
– Centre , radius
– Centre , diameter
– 2p
– 3p
– TTr
– TTT
• How to activate command
TARUN B PATEL MECHANICAL DEPT

21. Center n Radius
• Command: _circle [enter]
– Specify center point for circle or [3P/2P/Ttr (tan tan
radius)]: 50,50 [enter]
– Specift the radius of circle or [Diameter]:50 [enter]
50
TARUN B PATEL MECHANICAL DEPT

22. Center n Daimeter
• Command: _circle [enter]
– Specify center point for circle or [3P/2P/Ttr (tan tan
radius)]: 50,50 [enter]
– Specify the radius of circle or [Diameter]:d [enter]
– Specify the radius of circle:100 [enter]
100
TARUN B PATEL MECHANICAL DEPT

23. Circle with 2P & 3P
• Command: _circle [enter]
– Specify center point for circle or [3P/2P/Ttr (tan tan
radius)]: 2P or 3P [enter]
– Specify first end point of circle's diameter: select pt
– Specify second end point of circle's diameter: select pt
– Specify third end point of circle's diameter: select pt
TARUN B PATEL MECHANICAL DEPT

24. Circle by TTR
• Command: _circle [enter]
– Specify center point for circle or
[3P/2P/Ttr (tan tan radius)]: ttr
[enter]
– Specify point on object for first
tangent on circle: select pt
– Specify point on object for
second tangent on circle: select
pt
– Specify radius of circle: 32.5
R32.5
TARUN B PATEL MECHANICAL DEPT

25. Circle by TTt
• Command: _circle [enter]
– Specify center point for circle or
[3P/2P/Ttr (tan tan radius)]: ttt
[enter]
– Specify first point on circle:
select pt
– Specify second point on circle:
select pt
– Specify third point on circle:
select pt
c
TARUN B PATEL MECHANICAL DEPT

26. Polyline
Command: PL
PLINE
Specify start point: 50,50
Specify next point or [Arc/Halfwidth/Length/Undo/Width]:
100
Specify next point or
[Arc/Close/Halfwidth/Length/Undo/Width]: 50
Specify next point or
[Arc/Close/Halfwidth/Length/Undo/Width]: a
[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second
pt/Undo/Width]: 20
Specify endpoint of arc (hold Ctrl to switch direction) or
[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second
pt/Undo/Width]: 60
Specify endpoint of arc (hold Ctrl to switch direction) or
[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second
pt/Undo/Width]: 20
Specify endpoint of arc (hold Ctrl to switch direction) or
[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second
pt/Undo/Width]: l
Specify next point or
[Arc/Close/Halfwidth/Length/Undo/Width]: cTARUN B PATEL MECHANICAL DEPT

27. Arc
TARUN B PATEL MECHANICAL DEPT

28. Arc …
• Arc by 3 point
– Command: _arc
– Specify start point of arc or [Center]:
– Specify second point of arc or [Center/End]:
– Specify end point of arc:
TARUN B PATEL MECHANICAL DEPT

29. Arc …
TARUN B PATEL MECHANICAL DEPT

30. Rectangle
Command: _rectang
Specify first corner point or
[Chamfer/Elevation/Fillet/Thickness/Width]:
50,50
Specify other corner point or
[Area/Dimensions/Rotation]:200,100 or
@150,50
Command: _rectang
Specify first corner point or
[Chamfer/Elevation/Fillet/Thickness/Width]:
50,50 [enter]
Specify other corner point or
[Area/Dimensions/Rotation]:D [enter]
Specify length for rectangles :150 [enter]
Specify width for rectangles: 50 [enter]
Specify other corner point or
[Area/Dimensions/Rotation]:
TARUN B PATEL MECHANICAL DEPT

31. Rectangle with chamfer
Command: _rectang
Specify first corner point or
[Chamfer/Elevation/Fillet/Thickness/Width]: c
Specify first chamfer distance for rectangles
<10.0000>: 10
Specify second chamfer distance for rectangles
<10.0000>: 10
Specify first corner point or
[Chamfer/Elevation/Fillet/Thickness/Width]:
Specify other corner point or
[Area/Dimensions/Rotation]: d
Specify length for rectangles <100.0000>: 150
Specify width for rectangles <40.0000>: 50
TARUN B PATEL MECHANICAL DEPT

32. Rectangle with Fillet
Command: REC
RECTANG
Specify first corner point or
[Chamfer/Elevation/Fillet/Thickness/Width]: f
Specify fillet radius for rectangles <10.0000>:10
Specify first corner point or
[Chamfer/Elevation/Fillet/Thickness/Width]:
Specify other corner point or
[Area/Dimensions/Rotation]: d
Specify length for rectangles <150.0000>: 100
Specify width for rectangles <50.0000>:50
Specify other corner point or
[Area/Dimensions/Rotation]:
TARUN B PATEL MECHANICAL DEPT

33. Polygon Command: POL
POLYGON
Enter number of sides <4>: 5
Specify center of polygon or [Edge]:
Enter an option [Inscribed in
circle/Circumscribed about circle] <I>: I
Specify radius of circle: 50
Command: _polygon
Enter number of sides <5>: 8
Specify center of polygon or [Edge]:
Enter an option [Inscribed in
circle/Circumscribed about circle] <I>: C
Specify radius of circle: 50
TARUN B PATEL MECHANICAL DEPT

34. Ellipse
Command: _ellipse
Specify axis endpoint of ellipse or
[Arc/Center]: _c
Specify center of ellipse:
Specify endpoint of axis: 50
Specify distance to other axis or
[Rotation]: 20
TARUN B PATEL MECHANICAL DEPT

35. Hatch
Command: _hatch
Pick internal point or [Select
objects/Undo/seTtings]:
TARUN B PATEL MECHANICAL DEPT

36. Autocad Setting commands
UNITS
TARUN B PATEL MECHANICAL DEPT

37. Autocad Setting commands
LIMITS
Command: LIMITS
Reset Model space limits:
Specify lower left corner or [ON/OFF]
<0.0000,0.0000>:00,00
Specify upper right corner
<420.0000,297.0000>:420,297
TARUN B PATEL MECHANICAL DEPT

38. Autocad Setting commands
GRIDMODE [F7]
Command: GRID <Grid off>
Specify grid spacing(X) or
[ON/OFF/Snap/Major/aDaptive/Limits/Follow/
Aspect] <10.0000>:
TARUN B PATEL MECHANICAL DEPT

39. Autocad Setting commands
SNAPMODE [F9]
Command: SNAP <Grid on>
Specify snap spacing or
[ON/OFF/Aspect/Legacy/Style/Type]
<10.0000>:
TARUN B PATEL MECHANICAL DEPT

40. Autocad Setting commands
DYNAMIC INPUT
DYNMODE ON DYNMODE OFFTARUN B PATEL MECHANICAL DEPT

41. Autocad Setting commands
ORTHOMODE
TARUN B PATEL MECHANICAL DEPT

42. Autocad Setting commands
POLAR TRACKING[F10]
TARUN B PATEL MECHANICAL DEPT

43. Autocad Setting commands
ISOMETRIC DRAFTING
TARUN B PATEL MECHANICAL DEPT

44. Autocad Setting commands
OBJECT SNAP TRACKING
(AUTOSNAP) [F11]
TARUN B PATEL MECHANICAL DEPT

45. Autocad Setting commands
OBJECT SNAP (OSNAP) [F3]
TARUN B PATEL MECHANICAL DEPT

46. Autocad Setting commands
LWDISPLAY
TARUN B PATEL MECHANICAL DEPT

47. Autocad Setting commands
WORKSPACE SWITCHING
TARUN B PATEL MECHANICAL DEPT

48. Autocad Modify Commands
• MOVE
• COPY
• ROTATE
• TRIM
• EXTEND
• MIRROR
• FILLET
• CHAMFER
• ERASE
• OFFSET
• ARRAY
• STRETCH
• SCALE
• BREAK
• LENGTHEN
• ALIGN
TARUN B PATEL MECHANICAL DEPT

49. Autocad Modify commands
MOVE Command: _move
Select objects: 1 found
Select objects:
Specify base point or [Displacement]
<Displacement>:
Specify second point or <use first point as
displacement>:
TARUN B PATEL MECHANICAL DEPT

50. Autocad Modify commands
COPY
Command: _copy
Select objects: 1 found
Select objects:
Current settings: Copy mode = Multiple
Specify base point or [Displacement/mOde]
<Displacement>:
Specify second point or [Array] <use first
point as displacement>:
Specify second point or [Array/Exit/Undo]
<Exit>:
Specify second point or [Array/Exit/Undo]
<Exit>:
Specify second point or [Array/Exit/Undo]
<Exit>:
Specify second point or [Array/Exit/Undo]
<Exit>:
TARUN B PATEL MECHANICAL DEPT

51. Autocad Modify commands
ROTATE
TARUN B PATEL MECHANICAL DEPT

52. Command: _rotate
Select objects: Specify opposite corner: 5
found
Select objects:
Specify base point:
Specify rotation angle or [Copy/Reference]
<0>: 30
ROTATE
TARUN B PATEL MECHANICAL DEPT

53. Autocad Modify commands
TRIM
TARUN B PATEL MECHANICAL DEPT

54. Command: TR
TRIM
Select object to trim or shift-select to extend
or
[cuTting
edges/Crossing/mOde/Project/eRase]:
Select object to trim or shift-select to extend
or
[cuTting
edges/Crossing/mOde/Project/eRase/Undo]:
Select object to trim or shift-select to extend
or
[cuTting
edges/Crossing/mOde/Project/eRase/Undo]:
Select object to trim or shift-select to extend
or
TRIM
TARUN B PATEL MECHANICAL DEPT

55. Autocad Modify commands
OFFSET
TARUN B PATEL MECHANICAL DEPT

56. OFFSET
Command: _offset
Specify offset distance or
[Through/Erase/Layer] <5.0000>: 100
Select object to offset or [Exit/Undo] <Exit>:
Specify point on side to offset or
[Exit/Multiple/Undo] <Exit>:
TARUN B PATEL MECHANICAL DEPT

57. Autocad Modify commands
EXTEND
TARUN B PATEL MECHANICAL DEPT

58. EXTEND
EXTEND
Select object to extend or shift-select to trim
or
[Boundary edges/Crossing/mOde/Project]:
Select object to extend or shift-select to trim
or
[Boundary
edges/Crossing/mOde/Project/Undo]:
TARUN B PATEL MECHANICAL DEPT

59. Autocad Modify commands
MIRROR
TARUN B PATEL MECHANICAL DEPT

60. Command: _mirror
Select objects: Specify opposite corner: 1
found
Select objects:
Specify first point of mirror line: 10
Specify second point of mirror line:
Erase source objects? [Yes/No] <No>:
MIRROR
TARUN B PATEL MECHANICAL DEPT

61. Autocad Modify commands
ARRAY
TARUN B PATEL MECHANICAL DEPT

62. RECTANGULAR ARRAY
Command: AR
ARRAY
Select objects: 1 found
Select objects:
Enter array type [Rectangular/PAth/POlar]
<Rectangular>: R
Type = Rectangular Associative = Yes
Select grip to edit array or [ASsociative/Base
point/COUnt/Spacing/COLumns/Rows/Levels/eXit]<eXit
>: COU
Enter the number of columns or [Expression] <4>: 6
Enter the number of rows or [Expression] <3>: 5
Select grip to edit array or [ASsociative/Base
point/COUnt/Spacing/COLumns/Rows/Levels/eXit]<eXit
>: S
Specify the distance between columns or [Unit cell]
<41.19>: 50
Specify the distance between rows <53.7247>: 60
Select grip to edit array or [ASsociative/Base
point/COUnt/Spacing/COLumns/Rows/Levels/eXit]<eXit
>:
TARUN B PATEL MECHANICAL DEPT

63. POLAR ARRAY
Command: AR
ARRAY
Select objects: 1 found
Select objects:
Enter array type [Rectangular/PAth/POlar]
<Rectangular>: PO
Type = Polar Associative = Yes
Specify center point of array or [Base
point/Axis of rotation]:
Select grip to edit array or [ASsociative/Base
point/Items/Angle between/Fill
angle/ROWs/Levels/ROTate items/eXit]<eXit>:
I
Enter number of items in array or [Expression]
<6>: 12
Select grip to edit array or [ASsociative/Base
point/Items/Angle between/Fill
angle/ROWs/Levels/ROTate items/eXit]<eXit>:TARUN B PATEL MECHANICAL DEPT

64. PATH ARRAY
Command: AR
ARRAY
Select objects: 1 found
Select objects:
Enter array type [Rectangular/PAth/POlar]
<Polar>: PA
Type = Path Associative = Yes
Select path curve:
Select grip to edit array or
[ASsociative/Method/Base point/Tangent
direction/Items/Rows/Levels/Align items/Z
direction/eXit]<eXit>:
TARUN B PATEL MECHANICAL DEPT

65. Autocad Modify commands
CHAMFER
TARUN B PATEL MECHANICAL DEPT

66. CHAMFER
CHAMFER
(TRIM mode) Current chamfer Dist1 = 0.0000,
Dist2 = 0.0000
Select first line or
[Undo/Polyline/Distance/Angle/Trim/mEthod/
Multiple]:
Select second line or shift-select to apply
corner or [Distance/Angle/Method]: D
Specify first chamfer distance <0.0000>: 20
Specify second chamfer distance <20.0000>:
25
Select second line or shift-select to apply
corner or [Distance/Angle/Method]:
TARUN B PATEL MECHANICAL DEPT

67. CHAMFER
Command: CHA
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
<0.0000>: 20
Specify chamfer angle from the first line <0>:
45
Select first line or
[Undo/Polyline/Distance/Angle/Trim/mEthod/
Multiple]:
Select second line or shift-select to apply
corner or [Distance/Angle/Method]:
TARUN B PATEL MECHANICAL DEPT

68. Autocad Modify commands
FILLET
TARUN B PATEL MECHANICAL DEPT

69. FILLET Command: _fillet
Current settings: Mode = TRIM, Radius = 10.0000
Select first object or
[Undo/Polyline/Radius/Trim/Multiple]: R
Specify fillet radius <25.0000>: 10
Select first object or
[Undo/Polyline/Radius/Trim/Multiple]:
Select second object or shift-select to apply corner
or [Radius]:
Command: _fillet
Current settings: Mode = TRIM, Radius = 10.0000
Select first object or
[Undo/Polyline/Radius/Trim/Multiple]: R
Specify fillet radius <10.0000>: 25
Select first object or
[Undo/Polyline/Radius/Trim/Multiple]:
Select second object or shift-select to apply corner
or [Radius]:
TARUN B PATEL MECHANICAL DEPT

70. Autocad Modify commands
SCALE
TARUN B PATEL MECHANICAL DEPT

71. SCALE
Command: _scale
Select objects: 1 found
Select objects:
Specify base point:
Specify scale factor or [Copy/Reference]: 0.5
TARUN B PATEL MECHANICAL DEPT

72. Autocad Annotation Commands
TARUN B PATEL MECHANICAL DEPT

73. Annotation Types
TARUN B PATEL MECHANICAL DEPT

74. Dimension Style
TARUN B PATEL MECHANICAL DEPT

75. Dimension Style
TARUN B PATEL MECHANICAL DEPT

76. TARUN B PATEL MECHANICAL DEPT

77. Autocad Line Properties
TARUN B PATEL MECHANICAL DEPT

78. TARUN B PATEL MECHANICAL DEPT

79. Autocad Layers
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82. TARUN B PATEL MECHANICAL DEPT

83. Autocad Plotting
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