1. MEMB113 14 AutoCAD Part 3

2. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Content More drawing & editing commands –Fillet, chamfer, break, mirror –Construction line & ray –Multiline, polyline and spline –Ellipse Sectioning & hatching Producing isometric drawing using AutoCAD

3. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Fillet Creates round/fillet at square corner –[pd menu] > Modify > Fillet or [Icon Fillet] –Specify fillet radius –Select 1 st object and 2 nd object 1 st object2 nd objectFillet icon 1 st object 2 nd object BeforeAfter Before After

4. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Chamfer To create bevel at square corner –[pd menu] > Modify > Chamfer or [Icon Chamfer] Chamfer icon 1 st line2 nd lineBefore After BeforeAfter 1 st line2 nd lineBefore After 1 st line2 nd line

5. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Break To remove a part of an entity between two specified points –[pd menu] > Modify > Break –Command: break or [Icon Break] –Click on object, & click/specify 1 st point –Click to specify 2nd point Select object/1st point 2nd point Select object/1st point2nd point Break icon

6. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Mirror To create copy of object(s) – mirror image –[pd menu] > Modify > Mirror or [Icon Mirror] –First, select object(s), press enter when finished –Specify mirror line, click 1 st point & 2 nd point –Delete source object, Yes or No Mirror line 1 st point 2 nd point BeforeAfter Mirror icon

7. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Construction line & Ray Construction line –To create infinite straight line through specified 2 points –Command: xline or [pd menu] > Draw > Const.Line Ray –To create ‘semi-infinite straight line’ from a specified point –Command: ray or [pd menu] > Draw > Ray Construction line icon 1st point 2nd point

8. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Multiline To create multiline –[pd menu] > Draw > Multiline or [Icon Multiline] –Command: mline Multiline icon 2nd point 1st point

9. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Polyline To draw 2D polyline – a ‘mix’ of straight line and arc –[pd menu] > Draw > Polyline or [Icon Polyline] –command:pline Change to arc Command: _pline Specify start point: Current line-width is 0.0000 Specify next point or [Arc/Halfwidth/Length/Undo/Width]: Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: a Specify endpoint of arc or [Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: Specify endpoint of arc or [Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: l Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: a Specify endpoint of arc or [Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: Specify endpoint of arc or [Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: l Change to arc Change to line Polyline icon 2nd point 1st point

10. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Ellipse To draw an ellipse or ellipse arc –[pd menu] –Command: ellipse Using endpoint and distance 1 st : Center 2 nd : Endpoint 3 rd : Distance to other axis 1 st : Center 1 st Endpoint 2 nd Endpoint Center Axis, End Arc 1 st Endpoint 2 nd Endpoint 3 rd : Distance to other axis Start angleEnd angle 3 rd : Distance to other axis 3 rd : Distance to other axis

11. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Spline To draw an irregular smooth curve –[pd menu] > Draw > Spline or [Icon Spline] Specify start tangent or Enter Specify end tangent or Enter Spline icon Examples of objects created using spline command 1st point 2nd point 3rd point 4th point 5th point

12. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Hatch (cross section) To create hatch pattern for cross section cut –[pd menu] > Draw > Hatch… or [Icon Hatch] –Command: bhatch Steps –(1) Pick Points –(2) Select Objects –(3) Change pattern, angle & scale –(4) Click Preview button to preview result –Change pattern, angle & scale if required –Click OK to accept (1) (2) (3) (4) Hatch icon

13. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 5.18 Hatch … cont Click inside for Pick Point Select object Remove island Associative Default hatchInitial object (hatch updated when boundary is modified)

14. MEMB113 Isometric in AutoCAD

15. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Setting up isometric grid/snap The grid/snap style should be changed to isometric snap –Right click on grid button on status bar, choose ‘Settings…’ –Drafting setting window displaying Snap and Grid tab is displayed Rectangular Isometric

16. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Changing isoplane Changing the isoplane – left, top, right –Cycle by pressing CTRL+E or F5 or –Command: isoplane {enter} RightTopLeft

17. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Drawing lines, circles and arc Isometric lines and non-isometric lines can be drawn using line or polyline command Isometric circle can be drawn using ellipse command –Draw ellipse > isocircle Isometric quarter circle and semi circle can be drawn using ellipse arc command –Draw ellipse arc > isocircle

18. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Creating round corner BeforeAfter Draw ellipse arc Draw another ellipse arc Draw straight line from midpoint of top arc to midpoint of bottom arc Trim

19. MEMB113 | Dept. of Mechanical Engineering | UNITEN | 2005 14 AutoCAD 3 Other useful tips Use COPY command with polar relative coordinate system or OSNAP. Do not use OFFSET command. Set up LAYER before drawing. Use construction line as a guide (recommended to use different colour)