To do this job, a mechanism called a clapper box with the Rocker ARM will be used to minimize the tool wear. But during the return stroke of the tool, the tool has to be lifted upwards bringing it back without having contact with the workpiece, and again at the beginning of Forwarding stroke/cutting stroke, the tool should take a position for removing the material from the workpiece. In the total movement of Ram, the maximum velocity occurs at the middle of the Return stroke, the next maximum possible velocity occurs at the end of the Return stroke and the lowest velocity occurs at the beginning of the forward stroke.ĭuring the metal removal process in shaping operation, physician the tool should be in position for removing the material from the workpiece during the cutting stroke. To get the variable velocity of Ram even though the crank is rotating at uniform velocity, a mechanism is used between the Ram and the crank called Whitworth’s quick return mechanism which is one of the inversions of single slider-crank mechanism. Whitworth Quick return Mechanism used in shaper machine To get the different velocities of Ram, it is not possible to have different velocities of the crank in two different half revolutions of the crank. As per the requirement of a shaper machine, the velocity of forward and return strokes must be different. In shaping machine, the half revolution of crank produces forward stroke and another half revolution of the crank produces return stroke. Crank Type or Whitworth Quick Return Mechanism:
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