Worm Wheel is an all metallic self contained apparatus useful for demonstrating the efficiency of worm and wheel and also the principle of work. The equipment consisting of a machine cut worm gear of 25 cm diameter, carrying a metal drum of 12 cm diameter and machine cut worm on steel spindle carrying a 12 cm diameter pulley. The whole arrangement is fixed on heavy cast iron brackets capable to be fixed to a wall. The Worm Wheel comes complete with effort pulley, string and hook but without weights. Single PurchaseDouble PurchaseTriple Purchase