Page 19 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Fig 7

Exercise 1.8
Draw internal tangents to circles of same diameter 40 each and center distance 60 mm. (Fig 8)
• Mark two points C and C 60 mm apart.
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• Draw circles of 40 with centres C and C .
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• Mark 'A' the midpoint of C C .
1 2
• Bisect C A and mark it as B.
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• 'B' as centre C B as radius, draw an arc and get points P and P .
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• 'A' as centre AP as radius, draw an arc and get points P and P .
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• Join P P and P P .
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• Mark them as T and T , the internal tangents.
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Fig 8

Exercise 1.9
Draw tangential curves for the circles of diameter 30 mm and 20 mm. (Fig 9)
• Draw centers C and C at a distance of 60 mm.
1 2
• Draw the given circles of dia 30 and dia 20 on C and C .
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• C as center and radius 35 (R15 + R20), draw arcs on either side of horizontal center line.
1
Fig 9

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CITS :Engineering Drawing (Mechanical) - Exercise 1