Answer to Question #133648 in Mechanical Engineering for Sazid

Question #133648
The Whitworth quick return motion mechanism has the driving crank AC=150 mm long.
The distance between fixed centres CD= 100 mm. The line of stroke of the ram passes
through the centre of rotation of the slotted lever whose free end is connected to the
ram by a connecting link. Find the ratio of time of cutting to time of return.
1
Expert's answer
2020-09-17T14:25:29-0400

Quick return ratio = {Time of cutting/time of return}

AC2 =150 mm ,CD = 100mm

Cos  = 

  = 

 = 48.2°

b = 96.4°

QRR =

=2.735


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