This experiment unit demonstrates the working of a simple screw jack. The complete unit is based on a sturdy bench-mounted base incorporating a turntable that is fitted with a metric square pitch screw jack thread. The apparatus is stood on a firm bench and a cord is wound around the circumference of the turntable. The free end of the cord is threaded over a pulley and then hangs vertically to accept the load hanger supplied.

A set of calibrated weights (supplied) when suspended from the load hanger produce a calculated torque on the system. To adjust the experimental parameters further the calibrated weights can also be applied to the top surface of the turntable.