CRANK MECHANISM - Simple link mechanism in engineering drawing

This video would teach you how to draw ( crank mechanism ) simple link mechanism in engineering and technical drawing.
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Question: In the given mechanism the crank OA revolves anticlockwise about O. The end B of the rod AB is constrained to move always along PQ. Plot the locus of R for one revolution of OA, if OA is 30 cm, AB is 105 cm and AR is 70 mm. Use scale 1 mm to 1 cm
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