The shearing mechanism is used to quickly cut long sections

The shearing mechanism is used to quickly cut long sections of extruded plastic into 1 inch pieces In order to make a nice smooth cut, the motor must turn the crank at 300 rpm. At the instant shown, the blade is about to contact the plastic piece being cut. Determine the velocity required to make a nice smooth cut.

Solution

The velocity can be calculated as following:

V = rxw

={(4cos40-0.75cos40)/2} x{2×300/60}

=39.1 in/s