In a Whitworth quick return motion mechanism, as shown in Fig.1.52, the distance between the fixed centres

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In a Whitworth quick return motion mechanism, as shown in Fig.1.52, the distance between the fixed centres is 60 mm and the length of the driving crank is 80 mm. The length of the slotted lever is 160 mm and length of the connecting nod is 140 mm. Find the ratio of the time of cutting stroke to the time of return stroke and also the effective stroke.

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