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# Lecture ii using drawing tools

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### Lecture ii using drawing tools

1. 1. Engineering Drawing I Lecture – II Using Drawing Tools & Applied Geometry Hafiz Ahmad Ashfaq
2. 2. TOPICS Preparation of Tools. Using of Tools Applied Geometry
3. 3. Preparation of Tools
4. 4. Fastening Paper to Drafting Board 1. Place the paper close to the table’s left edge. 2. Move the paper until its lower edge place about the top edge of T-square.
5. 5. Fastening Paper to Drafting Board 3. Align the top edge of the paper with T-square blade. 4. Attach the paper’s corners with tape.
6. 6. Fastening Paper to Drafting Board 5. Move T-square down to smooth the paper. 6. Attach the remaining paper’s corners with tape.
7. 7. Using the Tools
8. 8. Function of the Tools Tools 1. T-square Shape to be drawn Straight line 2. Triangles 3. Compass Arc, Circle
9. 9. Using the Compass 1. Locate the center of the circle by two intersecting lines. 2. Adjust the distance between needle and lead to a distance equal to radius of the circle. 3. Set the needle point at center.
10. 10. Using the Compass 4. Start circle. Apply enough pressure to the needle, holding compass handle between thumb and index fingers. 5. Complete circle. Revolve handle clockwise. circle
11. 11. Draw a Horizontal Line 1. Press the T-square head against the left edge of the table. 2. Smooth the blade to the right.
12. 12. Draw a Horizontal Line 3. Lean the pencil at an angle about 60o with the paper in the direction of the . 4. Draw the line from left to right while rotating the pencil slowly.
13. 13. Draw a Vertical Line 1. Set T-square as before. Place any triangle on T-square edge. 2. Slide your left hand to hold both T-square and triangle in position.
14. 14. Draw a Vertical Line 3. Lean the pencil to the triangle. 4. Draw the line upward while rotating the pencil slowly.
15. 15. Draw a line at 45o with horizontal 1. Place 45o triangle on the T-square edge and press them firmly against the paper. 2. Draw the line in the direction as shown below.
16. 16. Draw a line at angle 30o and 60o 1. Place 30o-60o triangle on the T-square edge and press them firmly against the paper. 2. Draw the line in the direction as shown below.
17. 17. Draw the lines at 15o increment 0 deg. 15 deg. = −30 + 45 deg 30 deg. 45 deg. Already demonstrated. 60 deg. 75 deg. = 30 + 45 deg 90 deg. Already demonstrated.
18. 18. Draw the line passing through two given points 1. Place the pencil tip at one of the points. 2. Place the triangle against the pencil tip. 3. Swing the triangle around the pencil tip until its edge align with the second point. 4. Draw a line. A Given B A B
19. 19. Applied Geometry
20. 20. To Bisect a Line 1. Swing two arcs of any radius greater than half-length of the line with the centers at the ends of the line. 2. Join the intersection points of the arcs with a line. 3. Locate the midpoint. Given A A r1 B r1 B (not to scale)
21. 21. To Bisect an Angle 1. Swing an arc of any radius whose centers at the vertex. 2. Swing the arcs of any radius from the intersection points between the previous arc and the lines. 3. Draw the line. A (not to scale) Given A r2 r1 B C r2 C B
22. 22. To draw the line parallel to a given line and passes through a given point Given C +
23. 23. To draw the line parallel to a given line and passes through a given point Given C + Repeat
24. 24. To draw the line parallel to a given line with a specified distance Given distance = r r
25. 25. To draw the line parallel to a given line with a specified distance Given distance = r r Repeat
26. 26. To draw the line perpendicular to a given line at a given point Revolve method C +
27. 27. To draw the line perpendicular to a given line at a given point Revolve method C + Repeat
28. 28. To draw the line perpendicular to a given line at a given point Adjacent-sides method C +
29. 29. To draw the line perpendicular to a given line at a given point Adjacent-sides method C + Repeat
30. 30. To draw the line perpendicular to a given line at a given point Using Compass + C
31. 31. To draw the line perpendicular to a given line at a given point Using Compass r2 D A r2 > r1 r2 r1 + C B Repeat
32. 32. To draw the line perpendicular to a given line from a point not on the line Adjacent-sides method C +
33. 33. To draw the line perpendicular to a given line from a point not on the line Adjacent-sides method C + Repeat
34. 34. To draw the line perpendicular to a given line from a point not on the line Using compass + C
35. 35. To draw the line perpendicular to a given line from a point not on the line Using compass r2 + C D r2 A r1 B Note: You can also use revolve method. How ? Try by yourself !!! Repeat
36. 36. To draw a line making 15o with a given line and pass through a given point. Given C +
37. 37. To draw a line making 15o with a given line and pass through a given point. Given C +
38. 38. To draw a line making 30o with a given line and pass through a given point. Given C +
39. 39. To draw a line making 75o with a given line and pass through a given point. Given C +
40. 40. FILLET AND ROUND Round Sharp corner Fillet Round
41. 41. FILLET AND ROUND To draw the arc, we must find the location of the center of that arc. How do we find the center of the arc?
42. 42. To draw an arc of given radius tangent to two perpendicular lines Given arc radius r r r
43. 43. To draw an arc of given radius tangent to two perpendicular lines Given arc radius r center of the arc Starting point Ending point
44. 44. To draw an arc of given radius tangent to two lines Given arc radius r r + r +
45. 45. To draw an arc of given radius tangent to two lines Given arc radius r T.P.1 T.P.2
46. 46. To draw a line tangent to a circle at a point on the circle Given C
47. 47. To draw a line tangent to a circle from a point outside the circle Given mark a tangent point C
48. 48. When circle tangent to other circle Tangent point R1 C1 R2 C2 R1 + R 2 The center of two circles and tangent point lie on the same straight line !!!
49. 49. To draw a circle tangent to two circles I Given C + + C1 Example + C2
50. 50. To draw a circle tangent to two circles I Given Two circles and the radius of the third circle = R + C 1 + C2
51. 51. To draw a circle tangent to two circles I Given Two circles and the radius of the third circle = R center of the arc R + R1 R + R2 C R R2 R1 + C 1 + C2 Repeat
52. 52. When circle tangent to other circle Tangent point R1 R2 C1 C2 R2 − R1 The center of two circles and tangent point must lie on the same straight line !!!
53. 53. To draw a circle tangent to two circles II Given + + C2 C1 C+ Example
54. 54. To draw a circle tangent to two circles II Given Two circles and the radius of the third circle = R + C 1 + C 2
55. 55. To draw a circle tangent to two circles II Given Two circles and the radius of the third circle = R R R2 R1 + C + C 1 R – R1 C 2 R – R2 Repeat
56. 56. To draw a circle tangent to two circles III Given Two circles and the radius of the third circle = R R2 R1 +C2 C1 + R – R1 C R + R2
57. 57. To draw an approximate ellipse Given Major and minor axes
58. 58. To draw an approximate ellipse Given Major and minor axes Repeat
59. 59. How to Keep Your Drawing Clean Do Don’t