The Whitworth and quick-return mechanism represent a non-uniform movement of revolving crank slider. It produced a slow forward movement while a fast return movement. This mechanism is used in tools, packaging and transport machinery.

The unit generates non-uniform stroke movement by means of a Whitworth mechanism. The experimental unit comprises of the drive disk along-with crank and coupling, the driving rod and the cylinder. The angle is adjusted using the crank disk, and an angle scale is integrated into the base plate. A ruler is attached to the cylinder to measure the stroke. The elements are mounted on a sturdy wall-mounted base plate. Two handles make it easy to carry and stack the unit.