In Fig. 2, the crank OA rotates at a constant speed of 30 rev/min (CCW). Determine the stroke length of the cutting tool shown in

 In Fig. 2, the crank O₂A rotates at a constant speed of 30 rev/min (CCW). Determine the stroke length of the cutting tool shown in the quick return mechanism. Also, find out the ratio of cutting operation time and return operation time.

In the paper, it says to measure it with a scale so you just take arbitrary let's say 10 cm or mm whichever is suitable, and solve it.

The things taken arbitrarily please show them in a box for understanding; the subject is Kinematics analysis and synthesis from the theory of machines;
 

 

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