Intro Autocad 2

7/29/2019 Intro Autocad 2

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Introduction to AutoCAD

Ipek Gursel

[email protected]


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OUTLINE

Giving commands

Object snap

Zooming and panning

Drawing 2D shapes Drawing 3D shapes

Editing

UCS

Assignment


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How do we give a command?

Command line

Toolbars(view/Toolbars)

Drop-down menus

You can pick any one(s) that you are comfortable with.


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What is OSNAP?

Osnap (Object Snap) settings make it easierto select a 2d objects points Endpoint

Midpoint

Perpendicular

Center ntersection

Osnap will be active when

AutoCAD is expecting you to

pick a point on the working area Type osnap on your

command window:


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Zooming...

You will need to zoom in and out while drawingwith AutoCAD. This doesnt change your objectsor UCS, only the way you see your workingspace. This can be done in many ways:

1. Scroll bars2. Typing z or zoom in your command window.

All

Center

Dynamic Extents

Previous

Scale

Window


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Lets draw a LINE:

remember that AutoCAD recognizes anobject by its coordinates. You will need twogiven points to draw a line.

You can start at a random point on yourWCS for your FIRST POINT, but you shouldspecify the coordinates of your SECONDPOINT.

(x1,y1,z1)

(x2,y2,z2)


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Lets draw a LINE (1):

1. Give the command Type line on the command window, OR Click on the line icon on the Draw toolbar, OR Select Line on the Draw menu

2. Specify the first point (a) Click on a random point on your working area

(black space)3. Specify the second point in relation to the

first point @distance


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1. Hit F8 (ortho on)2. Give the command3. Specify the first point4. Specify the second point in relation to the

first point Point the cursor to the left hand side. You will

see that the cursor snaps only to 0o-90o-180o-270o

Type 7 and hit enter

a b7 units


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If we know the coordinates of the line we wantto draw, we can simply type them into thecommand line. (However, this mostly isnot the case.)

1. Give the command2. Specify the first point (4,8,11)

3. Specify the second point (5,11,23)

a

b

(4,8,11)

(5,22,13)


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What else?

Rectangle: two diagonal lines(pick first point, select the second one

with relation to the first. @5


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Editing

COPY

MOVE

MIRROR

ARRAY

SCALE

STRETCH


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More editing

STRETCH

EXPLODE

OFFSET

ROTATE

ERASE


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Polyline (pline)

The PLINE command creates a chain linewith multiple vertexes and straight orcircular segments between the vertexes

Draw a closed shape with the plinecommand:

Then type PEDIT (polyline edit) on thecommand line and see what you can dowith it:Enter an option [Close/Join/Width/Editvertex/Fit/Spline/Decurve/Ltype gen/Undo]:

Try Width and Spline


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Hatching

Hatching is used to add shaded patterns to objects andshapes within an Autocad drawing. Hatch patterns canbe used to indicate a material to be used, such as aconcrete hatch. Alternatively it could be used to make anarea of a drawing stand out.

You will pick:

Pattern

Scale

Angle

points


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Solids contain the mass properties of 3Dobjects.

You can use the Solids toolbar for readilyaccessible objects

Box Cylinder

Wedge

You can use the Boolean operations of

more complicated shapes. Union (join two solids)

Subtract (carve out the second solid from thefirst)

Intersection (only the common area)

Drawing SOLIDS

Torus Cone

Sphere


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To increase the number of faces

Tools > Options > Display tab >


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We can create solids by extruding as well

If youextrude

a surface into the thirddimension, you simply add a thickness insection. This basically is same as creating asolid object

Extrude 5units 5 units

Extrude -4units

4 units


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UCS and WCS

The AutoCAD world is 3 dimensional. However, if wewant to draw a 2d object, such as a plan or a section,we will use only 2 dimensions (x and y).

WCS (world coordinate system) is the imaginary planethat is parallel to the ground. It is the default coordinatesystem.

Modifications made to the World Coordinate System(WCS) result in a User Coordinate System (UCS). It isthe plane that you work on. It enables the user to draw3 dimensional objects.

To create a new UCS, type ucs on the command window,

then say New and specify 3 points on your new UCSplane.


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Lets change the UCS

Prompt: Command: Type ucs and press Enter. Prompt: Enter and option [New/Move/ orthoGraphic

/Prev/ Restore/Save/Del/ Apply/?/World] : Typein n for the New option and press Enter. Prompt: Specifyorigin of new UCS or [Zaxis/ 3point/ OBject/ Face/View/X/Y/Z : Type 3 to select the 3point option andpress Enter.

Prompt: Specify a new origin point :Use an Osnapor coordinate to select the position for a new 0,0,0 point (thisselects the junction of the X, Y, and Z axes). NOTE: TheintersectionOsnap will NOT work with solid models.

Prompt: Specify point on positive portion of X-axis:Use an Osnap or coordinate to selectthe direction of the desired X-axis. NOTE: The numbers inside the

brackets< > will not necessarily be the same as those shown inthis example.

Prompt: Specify point on positive-y portion of the UCS XYplane : Use an Osnap or coordinate toselect the direction of the Y-axis. The UCS icon should changeposition to indicate the new UCS orientation.


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Homework Assignment

Your perspective assignments are due nextweek (March 16, 2006, 5pm)

You will submit your *.dwg files by email.([email protected])

Late submission will be accepted subject toa mark penalty of 20% per day, up to twodays. No late submission will be acceptedafter March 18, 2006.

You can email me with your questions, orstop by my office anytime (A301)

Documents

Intro Autocad 2