Week-2•Objectives:

Understand the concept of Drawing ToolsTo get familiarize with the Erase Command, Selection Method, Circle command, Ellipse command and Pan

CommandPractice by using different Co-ordinates

AutoCAD

Introduction to Basic Drawing Tools

Command Shortcut Icon Description

Line L Draw a line using absolute, relative or polar co-ordinates

circle C Draw a circle with a center and radius

Rectangle Rec Draw a rectangle with width and height

Ellipse El Creates an ellipse using a specific center point and radius

Polygon pol Creates a polygon with desired number of sides

Pline Pl Draw a 2D polyline

St a r t i n g w i t h a Ne w Dr a w i n g Start AutoCAD and a new drawing by pressing the Application Button (top left corner) and pressing the new button to reveal the fly-out. Once you see the fly-out, click on Drawing.

You will see a dialog box open that asks you to select a template drawing to use (as shown below):

Select the "acad.dwt" template file and press the Open button to continue to the drawing screen

Once there, type in command prompt: Z <ENTER> & E <ENTER>, this will zoom into to the extents of the drawing area and make it easier to see what you are drawing (NOTE: nothing will appear to happen).

E x erc i s e 1 D r awi n g a 2 x 2 R ec t a n gle u s i n g A b s o l u t e

C o - o r d i n a t e s The first task is to draw a 2x2 rectangle using line command and absolute co-ordinates which we have covered in lab 1.

1. Start the LINE command by clicking on the icon or by typing line in the command line.2. Input the co-ordinates in the command line (1, 1) to (3, 1) to (3, 3) to (1, 3) to (1, 1).3. Your command history (F2 key) should be look like this:

oCommand: L LINE Specify first point: 1,1

oSpecify next point or [Close/Undo]: 3,1

oSpecify next point or [Close/Undo]: 3,3

oSpecify next point or [Close/Undo]: 1,3

oSpecify next point or [Close/Undo]: 1,1

oSpecify next point or [Close/Undo]: <ENTER>

For the last line, you can either type in 1, 1 or C to close the line back to the first point you entered.

E x erc i s e 2 D r awi n g a 3 x 3 R ec t a n gle u s i n g R e l a t ive

C o - o r d i n a t e s Now draw a similar box of dimensions 3x3 using relative co-ordinates.

1. Start the LINE command and begin at point 4,1. 2. Draw a line of three units to the right by typing @3,0

(this means 3 units in the X direction, 0 units in the Y direction based on the last point you entered).

3. Next type @0,3

4. Then @-3,0 5. Then @0,-3 to finish the box. 6. Remember to press enter after each point. 7. Your command history (F2 key) should be look like

this:oCommand: L LINE Specify first point: 4,1

oSpecify next point or [Close/Undo]: @3,0

oSpecify next point or [Close/Undo]: @0,3

oSpecify next point or [Close/Undo]: @-3,0

oSpecify next point or [Close/Undo]: @0,-3

oSpecify next point or [Close/Undo]: <ENTER>

E x erc i s e 3 D r awi n g a Dia m o n d u s i n g P o l a r

C o- o r d i n a t e s

Now we are going to draw a diamond type box using polar co-ordinate input.

1. Start the LINE command and begin at point 8,2 2. Then type @1<45 to draw the first line. 3. Next enter @1<135 4. Then @1<225

5. Then @1<315 (or C to close). 6. We have drawn a line of 1 unit length, 3 at 45o, then another at 135o and so on.7. Your command history (F2 key) should be look like

this:oCommand: L LINE Specify first point: @1<45

oSpecify next point or [Close/Undo]: @1<135

oSpecify next point or [Close/Undo]: @1<225

oSpecify next point or [Close/Undo]: @1<315

oSpecify next point or [Close/Undo]: <ENTER>

E x erc i s e 4 D r awi n g a Ci r c le in A u t oCAD

Start the CIRCLE command and add a circle that has a center point at (11,3) with a radius of 1.

F o l l o w t h e f o l l ow i ng s t e p s : 1. Command: c <enter>

2. CIRCLE Specify center point for circle or

[3P/2P/Ttr (tan tan radius)]: 11,3

3. Specify radius of circle or [Diameter]: 1

E x erc i s e 5 D r awi n g an e l l i p s e u s i n g e l l i p s e c o mm a n d

Now draw an ellipse by using ellipse command. Distance along the Y-axis between two end points is 2 units and distance along X-axis between two end points is 6 units.F o l l o w t h e f o l l ow i ng s t e p s : 1. Click on ellipse or type Command: ellipse <enter>

or el2. Specify axis endpoint of ellipse or [Arc/Center]:

11,5

3. Specify other endpoint of axis: 11,74. Specify distance to other axis or [Rotation]: 3

E x erc i s e 6 U s i n g t h e P o l ygo n c o mm a n d

A polygon is a regular shape width different number of sides inscribed or circumscribed by a circle with some radius. In a polygon all sides have same length and the interior angles of all the sides are also same.When you draw a polygon in AutoCAD then AutoCAD first ask you the number of sides, then center point of

polygon, then inscribed or circumscribed circle and finally the radius of polygon. Tr y t h e f o l l ow i ng c o mm a n d s . oCommand: poloPOLYGON Enter number of sides <4>: 6oSpecify center of polygon or [Edge]: 6.5,6.5oEnter an option [Inscribed in circle/Circumscribed

about circle] <I>: ioSpecify radius of circle: 1

E x erc i s e 7 U s i n g t h e P o l y l i n e c o m m a n d

A 2D polyline is a connected sequence of segments created as a single planar object. You can create straight line segments, arc segments, or a combination of the two.

1. Start by entering your first point. (1.5,5).2. Then (with Ortho or Polar on) move your cursor to the right and type 3 <ENTER>.3. Then A <ENTER> for arc.4. Move your cursor up and type 1.5 <ENTER> 5. Then type L <ENTER> (to go back to straight lines) and move your cursor to the left and type 3 <ENTER>6. Then back to arc (A <ENTER>) and then type CL to close the polyline.

oCommand: PLINE <enter> or ploSpecify start point: 1.5,5 Current line-width is

0.0000oSpecify next point or

[Arc/Halfwidth/Length/Undo/Width]: 3oSpecify next point or

[Arc/Close/Halfwidth/Length/Undo/Width]: A oSpecify endpoint of arc or

[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: 1.5

oSpecify endpoint of arc or

o[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: L

oSpecify next point or [Arc/Close/Halfwidth/Length/Undo/ Width]: 3

oSpecify next point or[Arc/Close/Halfwidth/Length/Undo/Width]: A

oSpecify endpoint of arc or[Angle/CEnter/CLose/Direction/Halfwidth/Line/Radius/Second pt/Undo/Width]: CL

E x erc i s e 8 U s i n g t h e R ec t a n g l e c o mm a n d

Finally we will use rectangle command. Let finish the drawing, by putting a 15"x8" border around the all the drawing starting at (0,0) using following commands.

oCommand: rec (RECTANG)oSpecify first corner point or

[Chamfer/Elevation/Fillet/Thickness/Width]: 0,0oSpecify other corner point or

[Area/Dimensions/Rotation]: 15,8

Note: We can also draw the rectangle using polar, absolute or relative co-ordinates. Use of polyline is also a good option for drawing rectangles and triangles as well.A t t h e e n d y o ur d r a w i n g w i ll be l oo k i n g li ke t h i s o n e :

ENGINEERING DRAWING & CAD (EEL-112)LAB TASK-2

1. Draw t h e f o l l o w i n g f i g u r e i n AutoCAD u s i n g p o l a r , a b s o l u t e a n d r e l a t i v e coordinates and enclose your drawing in a 10x7 rectangle starting form (0,

0)?

2. Use polyline command to reproduce the following drawing. Try to make it a single object, i.e.; do not break the poly line?

3. Use the drawing commands to draw the given shape?

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