In a Whitworth quick return motion mechanism, as shown in Fig.1.47, the distance between the fixed centres is 80 mm and the length of the driving crank is 100 mm. The length of the slotted lever is 180 mm and the length of the connecting rod is 150 mm. Calculate the ratio of the time of cutting to return strokes.

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30 P A D A2 B/2 a (a) (b) Fig.1.47 Whitworth mechanism 0