cad tutor 2

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KKKL3104 CAD/CAE JKEES, FKAB, UKM

AutoCAD Basics

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Contents

Introduction toAutoCADIntroduction to

drawingModifying commandsObject snaps

Accurate inputSelection sets

LayersDimensioningText

ScaleDirect distance entryObject tracking

Object propertiesZooming andpanning

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Introduction to AutoCAD

X,Y coordinate system (Cartesian)

Absolute points are exact points on the drawing space.

Relative points are relative to an object on the drawing space.

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Introduction to AutoCAD

Angular measurement

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Basic AutoCAD terminologyAbsolute coordinateAcad.dwtAssociated

dimensioningBackup fileBlockCrosshairsCursorDatabaseDialog box

Drawing template fileExtentsGrid

GripsLayerLayout tabsLimits (grid)LinetypeModel spaceModify

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Basic AutoCAD terminologyObjectOriginOrtho modeOsnap object snapPanPathPickPlot

Polar coordinatePropertyRelative coordinate

Selection setSnapStylesUnitsUser CoordinateSystem (UCS)ViewViewport

World CoordinateSystem (WCS)Zoom

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Introduction to drawing

The command line tells you whatinformation AutoCAD requires tocontinue

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Exercise 1

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Exercise 1 create a new file

Start AutoCADFile NewSelect acad.dwt template file Make sure DYN button in status bar isdepressed

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Exercise 1 draw the left square

Using absolute coordinate, in commandline, type: LINE (or L) 1,2 1,4 3,4

3,2 1,2

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Exercise 1 draw the center square

Using relative coordinate, in commandline, type: LINE 4.5,2 @2,0 @0,2

@-2,0 @0,-2

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Exercise 1 draw the right square

Using polar coordinate, in command line,type: LINE (or L) 8,2 @1

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Exercise 1 draw the circle

In command line, type: CIRCLE 7,6 (center point) 0.75 (radius)

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Exercise 1 draw the border

In command line, type: RECTANGLE (or REC ) 0,0 (starting point) 10,7 (end point)

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Exercise 2

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Exercise 2 draw the center square

Draw a square using RECTANGLE command by specifying 2 points torepresent the opposite corners.

Enter first point (first corner) as 4.5,2 Enter second point (second corner) usingrelative coordinate as @2,2

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Draw the square using MULTILINE .Before drawing the lines, set the SCALE (or S) to 0.15 (distance between lines).

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Erase the square using ERASE command,Then redraw the square by typing: ML (multiline)

S (scale) 0.15 (distance between lines) 8,2 @1.5,0 @0,1.5 @-1.5,0 C

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Exercise 2 trim

Draw a line (horizontal) from 2,5 to2,6.5 Draw another line (vertical) from 1,6 to3,6 Now you have 2 perpendicular linesNext step is to TRIM off the top of thevertical line to create a T

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Exercise 2 trim

Start the TRIM command.It will ask for a cutting edge . Select thehorizontal line and press .

It will ask for the object to betrimmed . Select the vertical lineanywhere above the horizontal (cutting)

line and press to finish thecommand.Next slide shows the command line

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Exercise 2 trim

Command: TR TRIMCurrent settings: Projection=UCS, Edge=NoneSelect cutting edges ...Select objects: 1 foundSelect objects: Select object to trim or shift-select to extendor[Fence/Crossing/Project/Edge/eRase/Undo]: Select object to trim or shift-select to extendor [Project/Edge/Undo]:

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Exercise 2 extend

Draw a LINE from 4,6.5 to 6,6.5 Draw another line from 5,5 to 5,6Next step is to EXTEND the verticalline up to meet horizontal line

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Exercise 2 extend

Start the EXTEND commandIt will ask for a boundary edge . Selectthe horizontal line and press

Then it will ask for an object to extend .Select anywhere in the top half of thevertical line and press

Press to end the commandNext slide shows what you saw on thecommand line

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Exercise 2 extend

Command: EX EXTENDCurrent settings: Projection=UCS, Edge=NoneSelect boundary edges ...Select objects: 1 foundSelect objects: Select object to extend or shift-select to trimor[Fence/Crossing/Project/Edge/Undo]: Select object to extend or shift-select to trimor [Project/Edge/Undo]:

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Exercise 2 offset

Draw a CIRCLE with a center point7.5,5.5 and radius of 0.5Next step will use the OFFSET

command to make another circle largerStart the OFFSET command and enter0.125 as the offset distanceSelect the circle and pick anywhereoutside the circlePress to end the command

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Exercise 2 object snaps

Next step is to draw a line from thecenter of the circle to the middle of thevertical line you extend earlier

Use Object Snap (or OSNAP ). TypeOS and press In the Object Snap dialog box, check off

(tick) the boxes of Object Snaps On,Endpoint, Midpoint, and Center andpress OK

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Exercise 2 object snaps

Start the LINE commandPlace your cursor on the circle (not themiddle of the circle) until you see a small

purple circle appear at its center. Leftclick to make this the start point of theline.Move the cursor towards the middle ofthe vertical line until you see a smalltriangle appear. Left click to accept this asyour endpoint. Press to end.

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Selection sets

Group objects together and then modifythemMost common way is to use a window to create a selection setTypes of window: Crossing window Selection box

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Selection setsDirection Called Display EffectRight to left Crossing window Green (with a

dotted outline)Selects any objectthat either crossesthe boundary or isinside it

Left to right Selection box Blue Selects on objectsthat arecompletely withinthe box

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Next lecture

LayersDimensioningTextScaleDirect distance entryObject trackingObject propertiesZooming and panning

cad tutor 2

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