Page 17 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Fig 3

• Draw another angular parallel line GH at a distance of given radius 20 mm. Both the parallel lines drawn meet
at `O'.
• With `O' as centre and `r' as radius (20 mm) draw an arc touching both lines AB and AC.

Exercise 1.4
Draw a loop of 3 circles pattern. (Fig 4)

• Draw any line MN and mark points A,B and C. So that AB = 20 mm and BC = 25 mm.
• With 'A' as centre draw concentric circles of dia 15 mm and dia 20 mm.

• With 'B' as centre draw concentric circles of 20 mm and 25 mm.
• With 'C' as centre draw concentric circles of 25 mm and 30 mm.
• Erase unwanted part of the circles to form the pattern.

Fig 4

Exercise 1.5
Draw the cam as per dimensions given. (Fig 5)

• Draw a vertical line and mark the points C C such that C C = 84 mm.
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2
2
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• C as centre, draw an arc of radius 56 mm (100-44) and C as centre, draw another arc of radius 78 mm (100-
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2
22). Both arcs cut at C .
3
• Similarly obtain a point C by drawing two arcs of radii 84 mm (44 + 40) and 62 mm (22 + 40) from points C
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4
and C .
2
• Draw a circle of radius 44 mm with C as centre and draw a circle or radius 22 mm with C as centre.
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1
• Produce C C and get points A and B.
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2
• C as centre and radius BC (100 mm) draw an arc.
3 3
• C as centre and radius 40 mm draw an arc.
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• Draw a circle of R10 with centre C .
2
• Rub off the unwanted lines and complete the pattern.
4
CITS :Engineering Drawing (Mechanical) - Exercise 1