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This is Whitworth Quick-Return Mechanism

For Crank and Slotted Lever Quick Return Motion Mechanism Click Here (    • Crank and Slotted Lever Quick Return Motio...   )

Kinematic simulation of Whitworth Quick-Return Mechanism.

Whitworth Quick-Return Mechanism is one of the most imporatant inversions of slider crank kinematic chain. It finds its applications in workshops to cut metals. The forward stroke takes a lot longer and cuts the metal whereas the return stroke is idle and takes a shorter period.

Above simulation shows it all , the motion of various links during the forward cutting stroke and the motion during the idle return stroke as well.

For more theory you can refer a good text book. I was able to construct the whole concept after reading books 1.) Theory OF machines , R.S.Khurmi and 2.) Theory OF machines , S.S.Rattan .