This apparatus is used to produce and analyze irregular reciprocating motion with slow feed and quick return. The model best demonstrates the transmission pattern of such an assembly. The input angle can be set by turning the crank and the output stroke can be read on a ruler on the slider. The apparatus consists of two cranks, i.e. driving crank and driven slider crank, ruler and rotating disc on which driven crank is attached. Whitworth’s quick return is used to generate uneven reciprocating motion with slow feed and quick return. This table model clearly demonstrates the transmission behaviour of such a layout. The input angle is set by turning the crank. The output stroke is read on a ruler on the slider. The transmission components are manufactured in aluminium. All axles are equipped with ball bearings. Due to its low weight, the unit is easy to carry using the two handles.
- Output stroke of Whitworth’s quick return as a function of the input angle of the drive crank.
- Benchtop experiment on the uneven reciprocating motion of Whitworth’s quick return
- Crank radius 46mm, slider radius 55mm, connecting rod length 145mm
- Slider crank and connecting rod mounted on ball bearings