AutoCAD Lab Manual 1 1 (1)

AutoCAD

CAD / CAM LAB MANUAL

DEPARTMENT OF MECHANICAL ENGINEERING

(Affiliated to Jawaharlal Nehru Technological University) Yeshwanthapour, Dist: Warangal – 506167

CHRISTU JYOTHI INSTITUTE OF TECHNOLOGY &

SCIENCE (Affiliated to Jawaharlal Nehru Technological University,HYD.)

Yeshwanthapur, Jangaon, Warangal(Dt)-506167

Experiment 1:

Aim: Start at the bottom left corner (1,1). Use the drawing tools you have learned in the previous lessons. You will have to use a combination of absolute, relative, and polar co-ordinate input.

Drawing:

List of commands: Command: line To point: @180<360 To point: @20<90 To point: @45<180 To point: @55<90 To point: @15<180 Command: line To point: @20<90 To point: @45<360 To point: @55<90 To point: @15<180 To point: @15<360 Command: _arc Center/<Start point>: Center/End/<Second point>: _e End point: Angle/Direction/Radius/<Center point>: _r Radius: r

Requires numeric distance or second point. Radius: 30 Result: An open bearing is drawn as per the dimensions shown in drawing by using 2D commands of Auto Cad.




Experiment 2: Aim: To draw the bracket shown in the drawing by using Auto Cad.

Drawing:

Command list: Command: _line From point: To point: @47.5<360 To point: @2.5,2.5 To point: @10<90 To point: @17.5<180 To point: @10<90 To point: @17.5<360 To point: @10<90 To point: @2.5,2.5 From point: To point: @-2.5,2.5 To point: @47.5<180 To point: @-2.5,-2.5 Command: _line From point: To point: @-2.5,2.5 Result : A Bracket is drawn by using various 2D commands of AutoCAD.




Experiment 3: Aim: Draw Isometric view from the given orthographic views of a part. Figures: Procedure: Command: units Press Enter Set units to ‘mm’ and precision to ‘0’ Click on ‘OK’ in ‘Drawing Units’ dialog box. Command: limits Press Enter Reset Model space limits: Specify lower left corner or [ON/OFF] <0,0>: Press Enter Specify upper right corner <12,9>: 150,100 Press Enter Command: zoom Press Enter Specify corner of window, enter a scale factor (nX or nXP), or [All/Center/Dynamic/Extents/Previous/Scale/Window/Object] <real time>: all Press Enter Regenerating model. Command: line Specify first point: Select any suitable point as the start point Specify next point or [Undo]: @10<-90 Specify next point or [Undo]: @50<30 Specify next point or [Close/Undo]: @60<90 Specify next point or [Close/Undo]: @8<210 Specify next point or [Close/Undo]: @35<-90 Specify next point or [Close/Undo]: @27<210 Specify next point or [Close/Undo]: c

Figure: 1

Command: copy Select objects: Select lines DE, EF, FG, GA, AB Select objects: Press Enter Specify base point or [Displacement] <Displacement>: Specify second point or <use first point as displacement>: @30<150 Specify second point or [Exit/Undo] <Exit>: Press Enter Command: line Specify first point: Select point D Specify next point or [Undo]: Select point D1 Specify next point or [Undo]: Press Enter Command: copy Select objects: Select line DD1 Select objects: 1 found Select objects: Press Enter Specify base point or [Displacement] <Displacement>: Specify second point or <use first point as displacement>: Select point D Specify second point or [Exit/Undo] <Exit>: Select point E Specify second point or [Exit/Undo] <Exit>: Select point F Specify second point or [Exit/Undo] <Exit>: Select point G Specify second point or [Exit/Undo] <Exit>: Select point A Specify second point or [Exit/Undo] <Exit>: Select point B Command: line Specify first point: Select point H Specify next point or [Undo]: Select point I Specify next point or [Undo]: Select point J

Figure: 2

Figure: 3

Figure: 4

Specify next point or [Close/Undo]: Press Enter Now Set Isometric Snap. For that right click on ‘OSNAP’ that is on status toolbar, select settings and in ‘Drafting Settings’ dialog box, click on ‘Snap and Grid’ tab and select ‘Isometric snap’. Command: ellipse Specify axis endpoint of ellipse or [Arc/Center/Isocircle]: i Specify center of isocircle: Select point K Specify radius of isocircle or [Diameter]: d Specify diameter of isocircle: 15 Command: ellipse Specify axis endpoint of ellipse or [Arc/Center/Isocircle]: i Specify center of isocircle: Select point L Specify radius of isocircle or [Diameter]: <Isoplane Top> d Specify diameter of isocircle: 15 Command: copy Select objects: Select circle in vertical plane Select objects: 1 found Select objects: Press Enter Specify base point or [Displacement] <Displacement>: Select point K Specify second point or <use first point as displacement>: @8<30 Specify second point or [Exit/Undo] <Exit>: Press Enter

Figure: 5

Figure: 5

Figure: 6

Command: trim Current settings: Projection=UCS, Edge=None Select cutting edges ... Select objects or <select all>: Select the Isocircle with K as center drawn earlier Select objects: 1 found Select objects: Press Enter Select object to trim or shift-select to extend or [Fence/Crossing/Project/Edge/eRase/Undo]: Select the Isocircle which was copied from earlier Select object to trim or shift-select to extend or [Fence/Crossing/Project/Edge/eRase/Undo]: Press Enter Command: erase Select objects: 1 found (Select line H-I) Select objects: 1 found, 2 total (Select line I-J) Select objects: Press Enter Command: r REDRAW Result:

Figure: 7




Experiment 4: Creating Solid model from the given orthographic views Using Extrude command Aim: To create solid model from the given orthographic views using Extrude command. Figures:

Procedure: Command: units Press Enter Set units to ‘mm’ and precision to ‘0’ Click on ‘OK’ in ‘Drawing Units’ dialog box. Command: limits Press Enter Reset Model space limits: Specify lower left corner or [ON/OFF] <0,0>: Press Enter Specify upper right corner <12,9>: 150,100 Press Enter Command: zoom Press Enter Specify corner of window, enter a scale factor (nX or nXP), or [All/Center/Dynamic/Extents/Previous/Scale/Window/Object] <real time>: all Press Enter Regenerating model. Command: pline Press Enter Specify start point: Select any point as the start point and Press Enter Current line-width is 0 Specify next point or [Arc/Halfwidth/Length/Undo/Width]: @25<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @6<270 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @20<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @6<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @25<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @7<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @15<180 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @17<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @8<180 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @-8,-12 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @5<270 Press Enter

Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @8<180 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @5<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @-8,12 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @8<180 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @17<270 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @15<180 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: c Press Enter Command: extrude Press Enter Current wire frame density: ISOLINES=4 Select objects to extrude: 1 found Select the polyline and Press Enter Select objects to extrude: Press Enter Specify height of extrusion or [Direction/Path/Taper angle]: 40 Press Enter Command: vpoint Current view direction: VIEWDIR=0,0,1 Specify a view point or [Rotate] <display compass and tripod>: 1,1,1 Regenerating model. Command: hide Regenerating model. Go to view menu > Visual Styles > Conceptual, to see solid model of stepped shaft. Using the options of ‘Orbit’ command, view point of the solid model can be changed. Result: Solid model is created from the given orthographic views.

Figure: Solid model




Experiment 5: Modeling Stepped Shaft using Revolve command Aim: To create solid model of Stepped Shaft from the given orthographic view using Revolve command. Figure:

Procedure: Command: units Press Enter Set units to ‘mm’ and precision to ‘0’ Click on ‘OK’ in ‘Drawing Units’ dialog box. Command: limits Press Enter Reset Model space limits: Specify lower left corner or [ON/OFF] <0,0>: Press Enter Specify upper right corner <12,9>: 150,100 Press Enter Command: zoom Press Enter Specify corner of window, enter a scale factor (nX or nXP), or [All/Center/Dynamic/Extents/Previous/Scale/Window/Object] <real time>: all Press Enter Regenerating model. Command: _pline Press Enter Specify start point: Select any point as the start point and Press Enter Current line-width is 0 Specify next point or [Arc/Halfwidth/Length/Undo/Width]: @20<0 Press Enter

Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @5<-90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @30<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @5<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @20<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @15<-90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @10<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @15<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @40<0 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @15<90 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: @120<180 Press Enter Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: c Press Enter Command: revolve Press Enter Current wire frame density: ISOLINES=4 Select objects to revolve: Select the polyline and Press Enter Select objects to revolve: 1 found Select objects to revolve: Press Enter Specify axis start point or define axis by [Object/X/Y/Z] <Object>: Select P1 and Press Enter Specify axis endpoint: Select P2 and Press Enter Specify angle of revolution or [STart angle] <360>: Press Enter Go to view menu > Visual Styles > Conceptual, to see solid model of stepped shaft. Using the options of ‘Orbit’ command, view point of the solid model can be changed. Result:

Figure: Solid model of Stepped shaft

Problems for Practice 1) Drawing:

SEQUENCE OF COMMANDS REQUIRED TO DRAW THE MODEL Click OSNAP and set Center, Midpoint, Endpoint, Intersection etc. Command: limits Reset Model space limits: Specify lower left corner or [ON/OFF] <0.0000,0.0000>: Specify upper right corner <420.0000,297.0000>: 150,150 Command: zoom Specify corner of window, enter a scale factor (nX or nXP), or [All/Center/Dynamic/Extents/Previous/Scale/Window] <real time>: all Regenerating model.

Command: line Specify first point: 20,20 Specify next point or [Undo]: @61.86<90 Specify next point or [Undo]: @20<-30 Specify next point or [Close/Undo]: @20<10 Specify next point or [Close/Undo]: @30<-20 Specify next point or [Close/Undo]: @20<-45 Specify next point or [Close/Undo]: @20<-135 Specify next point or [Close/Undo]: @30<-160 Specify next point or [Close/Undo]: @20<-190 Specify next point or [Close/Undo]: @20<-150 Specify next point or [Close/Undo]: Result: A Model is drawn by using various 2D commands of Auto Cad.

2) Drawing:

List of commands Command: _circle 3P/2P/TTR/<Center point>: 100,100 Diameter/<Radius>: 20 Command: circle 3P/2P/TTR/<Center point>: 100,100 Diameter/<Radius> <20.0000>: 30 Command: circle 3P/2P/TTR/<Center point>: 100,100 Diameter/<Radius> <30.0000>: 45 Command: circle 3P/2P/TTR/<Center point>: 100,100

Diameter/<Radius> <45.0000>: 60 Command: _circle 3P/2P/TTR/<Center point>: 100,145 Diameter/<Radius> <60.0000>: 7.5 Command: _array Select objects: 1 found Rectangular or Polar array (<R>/P): p Base/<Specify center point of array>: 100,100 Number of items: 8 Angle to fill (+=ccw, -=cw) <360>: Rotate objects as they are copied? <Y> y Result: A model is drawn in 2D by using built in commands of Auto Cad.

3)

The following is a list of all the commands required to complete Assignment 3. If your results are different than the sample drawing file, check your input against these. Press the F2 key to see your input. (Press F2 to close the text screen).

NOTE: If you are using AutoCAD R14 (or earlier), your command line may look different, but the input will still be the same.

Remember to press ENTER after entering each co-ordinate point. Command: l LINE From point: 1,1 Specify next point or [Undo]: 4.1,1 Specify next point or [Undo]: 4.5,2.2 Specify next point or [Close/Undo]: @2.3,0 Specify next point or [Close/Undo]: @1.4<30 Specify next point or [Close/Undo]: @0,2.1 Specify next point or [Close/Undo]: @1.6<120 Specify next point or [Close/Undo]: @-1.3,0 Specify next point or [Close/Undo]: @0,-1.4 Specify next point or [Close/Undo]: @2.2<135 Specify next point or [Close/Undo]: @-1,0 Specify next point or [Close/Undo]: @1.5<225 Specify next point or [Close/Undo]: @-1,0 Specify next point or [Close/Undo]: @2.3<-60 Specify next point or [Close/Undo]: 1,1




Exercise Problems

Exercise 1: Draw the following figures using various coordinate systems by setting the limits accordingly. Ex: If the figure is of size 3 x 2, limits may be set to 5,5. If it is 3000, 2000, the limits may be set to little higher than that.




Exercise 2: Draw the following orthographic views using Line command with the help of construction lines.




Exercise 3: Draw the following figures using various Draw and Modify commands.




Exercise 4: Draw the following figure with different line types.

All circles are of yellow color – layer-circles Boundary is Blue color – layer-boundary Hatch is cyan color – layer-hatch You can keep dimensioning in other layer




Exercise 5: Practice the dimensioning with any simple figures (self made by student) and become thorough in the dimensioning a drawing along with setting various parameters as changing the below.. 1) Size of the text 2) Size of the arrow 3) Distance from the object to the dimension labels etc After practicing the dimensioning thoroughly do the below tasks and show us how good you understood the dimensioning concept.




Exercise 6:

Draw the following Isometric figures.




Exercise 7:

Draw the following 3D wireframe model using AutoCAD 3D Commands.




Exercise 8:

Draw the following 3D figures using AutoCAD 3D Draw and Modify Commands.

Documents

AutoCAD Lab Manual 1 1 (1)