Auto Cad Project 3 - Drawing geometries by tools like line, circle, rectangle ,chamfer.
Open the autocad- click on create new drawing-select metric - for metric units
Open the autocad- click on create new drawing-set imperial -for feet and inches
Open the autocad- click on wizard in the dialogue box-advance settings-set units as architecture -for architectural drawing ,decimal -for decimal, engineering - for engineering.
1. Aim : To create the geometry
Procedure:
Open the autocad- click on wizard in the dialogue box-advance settings-set units as decimal ,
set angle in degree - base angle as east
mark angle direction in anticlockwise
Step:1
- create line by command "l" click on the first point( where we want to start) then give coordinate 3,0
- Then give the relative coordinate @2.12<135
- For the next coordinate we have created a right angle triangle, sinθsinθ=x2.83x2.83 ,x=2
cosθcosθ=y2.83y2.83 ,y=2
- so the next coordinate will be @-2,2
- And the next coordinate is @-2,0
- Then click on "close"
Step:2 Creating circles
- Create an offset of 1 unit from the bottom line of 3 units ie, the centre of circle in y direction
-Enter the command "c" for circle by centre diameter method.
- With" OSNAP -midpoint on "move the mouse on the bottom line of 3 units,then the midpoint 1.5 unit will be snapped.
- Move the mouse vertically towards the above offseted line , so the centre of circle can be located (intersection of the tracked midpoint line and the offseted line)
- Click to specify the centre of circle and give the diameter as 1.2 units
- Similarly, give offset of 2.5 units from the bottom line of 3 units .
- Enter the command "c" for circle (centre- diameter method)
- Specify the centre by "OSNAP on" midpoint and move the mouse towards the line of 2.5 units
- Click on the centre and give diameter of 0.8 units
- Erase("e"-seelct the line ) both the offseted line
Result: The geometry is drawn
2. Aim : To crete the geometry by Auto Cad tools
Procedure:
Open the autocad- click on wizard in the dialogue box-advance settings-set units as architecture ,
set angle in degree -
mark angle direction in anticlockwise ,set the base angle as east
- Draw line of length 2'6' with angle 210 degree by using line command
- With angle as 90 degree draw another line of length 3' .
- With ortho ondraw a line of length 2'5" vertically
- Draw another line of 8" vertically.
- Draw another line of 1'9" vertically downwards.
- With line command extend the horizontal with by the first point
- Then use line command and draw line of 2'10' from the last point of 1'9" length meeting the horizontal such that the included angle is 135 degree.
Result:The geometry is drawn:
3. Aim : To create the geometry
Procedure:
Open the autocad- click on wizard in the dialogue box- advanced settings-set units as engineering ,( it will be in feet and inches in decimal)
-set angle in degree
-mark angle direction in anticlockwise
Step:1 Create a rectangle
- Command "REC" - click on a point where we nedd to place rectangle
- Click on "dimension" give the length as 5'0.1" and width as 3'3''. and create rectangle
- Use command "CHA" for chamfer
- Click on "ANGLE" ,
- Then specify the distance of first line to be chamfered- give it as 1'9" ((3'3)-(1'6)=1'9(3′3)-(1'6)=1′9)
- Then specify the chamfer angle from the first line as 55 degree ie, (180-125=550
Step:2
- Comment "EXPLODE" and click the rectangle ,so that each line can be selected seperately.
- Drawn an offset of 1'6" vetically and 1'3" horizontally from the side of rectangle
- Create circle with centre-diametr method , the intersecting of two offseted line willbe the centre
- Command "C" - specify centre- click on intersecting lines
- Click on "dimaeter" and give the value as 1'6"
- Erase both the offsetted lines by command "E" select the objects and press enter.
Result : The geomerty is drawn.
4. Aim : To create the geometry
Procedure:
Here we are drawing by using polyline ,so first we have to find the dimensions not given directly.
Step: Use command "PL" for polyline and give the direction by moving the cursor to the desired position.
- To draw ab move the cursor to - x direction and give 3 units.
- To draw bc move cursor to + y direction and give 3 units
- To draw cd ,point cursor to + x direction and give 1 unit
- To draw de ,point cursor to + y direction and give 2 unit
- To draw ef point the cursor to + x direction and give 2.5 units
-To draw fg point the cursor to - y direction and give 3 units.
- To draw gh point the cursor to+ x direction and give 2.5 units
- To draw hi, point the cursor toward-y direction and give 2.5 units.
- To draw ij ,point the cursor towards - x direction and give 2.5 units
- To draw ja point the cursor to + y direction and give 0.5 units.
Result: The geometry is drawn
5. Aim : To create the geometry.
Procedure:
Step:1 Draw a rectangle
- Command "REC" click on the point where we want to create rectangle
- Give length as 11.5 units and width as 6 units
- Use command "EXPLODE" to make the rectangle into different line segments.
- Offset both vertical side of rectangle to a distance of 3 units command "o" - give ofset distance as 3 units
- Click inside the rectangle as the offseted line will be formed.
Step:2 Creating the circles - centre circle
- Make an offset 3 units from the bottom line of rectangle command "O" -distance = 3 units.
- Command "c" -specify the centre of the circle by "OSNAP ON" and by dragging the cursor along the top line of rectangle
- As the snap is on the midpoint of the line is snapped
- Then move the cursor downwards towars the offseted line ,then click on the line and specify the centre of circle
- Clickon "dimaeter" and give 3 units.
Step :3 Creating other two circles
- Give offset 1.5 units on both vertical sides -"O" -offset distance =1.5 units
- The intersecting line of both the horizontal offseted line(3units) and the vertical offseted line(1.5 units ) will be the centre of circle
- With centre and diameter method , circle is drawn
- Command "C" - specify the centre and give the diameter as 2 units
- The inside circle is drawn with same centre and diameter as 1 unit.
- Copy the 2 circles "CO"- specify base point- centre of circle is picked and placed in the intersection if the offseted line.
- Erase the offseted lines -"E" - select the objects and press enter
Result: The geomerty is drawn:
6. Aim : to draw the geometry
Procedure:
Step:1
- To draw 1. Line command "L" pick a point , give 2 units to + x direction and 1.5 units -y direction ,2 units to -x direction and "CLOSE"
- Make offset "O" -offset distance =0.5 units and give 2 lines as offset in y direction.
- Make offset from the right side line of unit 0.5 by command "O" and specifying the distance
- Trim the excess lines by command "TR" - select the bese point ( till where we want to trim) and seelcting the line we need to trim.
Step:2 To draw 2.
- Command "L" specify the first point as a projection of 1st figure by using object snap
- Give the distance as 1.5 units in - y direction and 2 units in - x direction
- Dive 1.5 units in + y direction and 2 unit in + x direction , thus forming a rectangle
- Use commans "CHA" to chamfer ,give the 1st distance as 1 units and 2nd distance as 1.5 units.
- Use command "L" and join the end point of the chamfered line ,thus forming a traingle at the top.
Step:3 To draw 3
- Draw line "L" and specify the first point by projecting the line of 2nd figure by using "OSNAP"on.
- With using line command draw a rectangle of side 1.5 units (1.5 unit in -x direction ,-y direction ,+x direction and + y direction)
- With the command offset "O" from the bottom line give an offset distance of 0.5 unit.
- Also give offset distance 0.5 unit from the left side ofthe rectangle
- Trim the unwanted lines by using command "TRIM" select the base line enter and select the unwanted lines and give enter.
Result: The geometry is drawn:
7. Aim : To draw the geometry
Procedure:
- Draw circle of radius 35 and another circle with same centre with dimaeter 50. Command "c" specify centre and give radius.
- Draw line with command "L" along the diammeter of the circle and then vertically upwards give distance as 100 units ,then + x axis a distance of 210 units and 75 units in - y direction.
- Draw offset 50 units ( 25+25=50, radius of arc) from the 75 unit line
- By arc strat ,end radius , draw an arc with the start point as the endpoint of 50 unit offseted line and the endpoint of 75 units.
- By the same centre , draw a circle of dimatere 30 units.
- Draw offset 60 units from the top.
- From the extended line from the 50 diameter circle draw line meeting the offseted line of 60 units.
- Delete the offseted line and continue the line horixontally until it meets the end of the arc created of radius 25.
- Drawing rectangle:
- Give offset of 20 units from the left side of the figureand 10 units from the top.
- Then draw rectangle with command "REC" specify the corner point as intersection of offseted lines.
- select "Dimension" and give the dimesion as 70 unit and 30 units.
- Similarly on the other side right create an offset of 20 units and copy the rectangle created earlier.
- Delete the offseted and unwanted lines.
- Trim the part of circle of radius 35 units so that it froms an arc.
- Then fillet the corners :
- Command "FILLET" click on radius and give the radius ,then select the two lines of which the corners are to be filleted.
-For the left and right side of the figure give 15 units as fillet radius
-Give fillet radius as 20 units and 6 units in the bottom side.
Result: The geometry is drawn:
8. Aim : To draw the geometry
Procedure:
Step:1
-Draw circle of dimater 4 units "c"- specify centre-click on "diameter" -give 4 units.
- Draw another circle of diameter 5 units with same centre - command "C" with osnap centre on - specify the centre- click on diameter give 5 units
- Draw a line of 4.275 units from the centre of circle- "L" -cursor is pointed to direction and give 4.275 units.
- Consider this as the centre of third circle with command "C" - specify the centre end of line and click on diameter and give 0.9units
- With same centre of circle four,drawn another circle with radius =0.9 units ,Command-"C" -specify centre and give the radius as 0.9.
- Mirror the two circles drawn on the other side -"MI"- select both the object-enter - specify the point of mirror line -mirror line is drawn vertically from centre of 5 unit circle and give erase the source object as no.
- With polyline draw tangent to the fourth circle of radius 0.9 and the first circle of diameter 5 units in top and bottom on both sides. with "OSNAP" tangent -on
- Delete the line drawn for refernce and trim the unwanted part of circle by command "TR"- specify the base object ,seelct the tangent line -seelct the object to be trimmed- seelct the circle and enter.
Result: The geometry is drawn:
9. Aim : Todraw the given geometry
Procedure:
- Draw a line 32'6" ,then draw two circles of radius 8' and 9' with centre as
- To draw the bottom arc , draw offset to both the circles with offset distance as radius of the bottom arc.
- Command "o"- select the circle -give offset distance as 20'10".
- We will get an intersection of the two circles ,from the intersecting point draw a line to the centre of the circle of radius 8' and 9'.
- The line meeting the circles will act as the tangent of the circle and its distance will be 20"10' same as the radius of arc.
- Draw a circle with centre as intersection point of the offseted circle and radius of 20'10".
- It will pass through the tanget points
- Trim the rest of the figure to get an arc and thus an arc of 20'10' will be formed.
- To draw the upper curve,
- Draw a circle with radius 32'8" (41'8'-9'=32'8") with centre same as that of radius 9' circle.
- Draw another circle with radius 33'8" (41'8'-8'=33'8") with centre same as that of radius 8' circle.
( so that the distance from the newly drawn crcle to the upper side of radisu 9' and 8' circle will be 41'8".)
- Draw perpendicular lines from the bottom intersection of both circles andthrough the centre to top of the circle of radius 8' and 9', which indicates the tangent points.
- Draw another circle ,with centre as the intersecting point of the bottom circles and with radius 41'8".
- It passes through the tagent lines drawn earlier.
- Trim off the rest , so that an arc of radius 41'8" is fromed between the tangents.
- Trim the part of the circle and the line connecting the centre of circles.
RESULT: The geometry is drawn.
10. Aim : To draw the geometry
Procedure:
By rectangle tool draw square
- Command "REC" - specify the point where we need to draw -click on "dimension" - here I have taken as length=5 units and breadth=5units.
- Take offset of 0.2 units outside the rectangle ,Command "O" - specify the distance =0.2 units.
- Create another rectangle os same size as in first step
- copy this sqaure,so that two squares are created.
- Rotate the second square by command "RO"- select the object-specify the base point -bottom point(The point by which we need to rotate) and rotate it by angle 45 degree
- With OSNAP on move the rectangle by command "M"- select object- specify base point ( here base point is selected as centre of square) and is moved and placed on centre of the first square by using osnap centre on
- Trim off the overlapping lines alternatively by comand "TR"- double enter
Result: The geometry is drawn
11. Aim : To draw the geometry
Procedure:
By using line command ,draw the outline
- Command "L" - give the distance of 2'8"(10'2"-(4'6"+3')) to + x direction
- With cursor pointing to - y direction give a distance of 1'2"
- With cursor pointing to + x direction draw a line of 4'6"
- With the cursor pointing to + y directio draw a line of 4'6" (13'6"-9')
- draw 3' in + x direction
- Draw 9' in + y direction.
- Draw 10'2" in - x direction
- With command "M" mirror the image , Command "M" - select the object- select the base point and give the mirror line -and click no so that the orginal object won't get erased.
- 
- Give offset line of distance 3'7" horizontaly by offset command "O"
- With midpoint of 10'2' draw a verical line of length 3'7"
- Draw lines on both sides such that the includedangle is 60 degree 30 degree on both side of the vertical line.
- Similarly on the other side ,locate the midpoint ,draw a vertical line of 2'8"and draw the inclined lines such that the included angle is 90degree
- Draw a line vertically downwards from the midpoint of the object (10'2")and offset the top line at a distance of 6'9" so that the centre point of the square is located.
- With command "polygon" draw a polygon of 4 sides,specify centre and give radius as 1.5' circumscribed inside a circle.
- Rotate the polygon to 45 degree with base point as centre
- Erase all the lines used for reference.
Result: The geometry is drawn
