This bench top unit comprises a sturdy base plate, which can be mounted vertically for demonstration purposes or flat for experimental use. On the left of the base is a large rotating protractor scale 'Crank' that rotates on a shaft and bearing arrangement. The increments on the protractor match with a indicator that ensure accurate reading of the angular movement of the scale. Integral to this protractor are varying radius positions used for locating the crankshaft. At the other end of the crankshaft is a slider 'Piston' that runs in a slide housing. A linear scale mounted to this housing ensures accurate readings of the piston displacement. An input disc can houses a crank pin, which can be fixed at various radii across the input disc face.
Adjustments can be made to the position of the crank shaft on the crank. This adjusts the crank length and hence the stroke of the piston. There are also three (3) positions available on the crank shaft to change the length of the crankshaft. For incremental angular movement of the protractor, the associated movement of the slider are recorded and plotted.
