The given Worm and Worm Wheel – Single Purchase is a robust mechanics laboratory apparatus designed to demonstrate the working of a worm gear lifting mechanism. It helps students study how rotary motion is transmitted through a worm and worm wheel system while gaining mechanical advantage in load-lifting applications.

The apparatus consists of a 25 cm diameter precision machine-cut worm wheel fitted with a 12 cm diameter metal drum. The worm wheel is driven by a machine-cut worm mounted on a steel spindle, which carries a 12 cm diameter effort pulley for applying effort. The complete assembly is mounted on a sturdy cast iron wall bracket for stable and smooth operation during experiments.

Supplied complete with effort pulley, string, and hooks, but without weights, this apparatus is suitable for schools, colleges, universities, and engineering physics laboratories.

Experimental Objectives

To demonstrate the working principle of a worm and worm wheel mechanism.
To determine the mechanical advantage of the apparatus.
To determine the velocity ratio of a single-purchase worm and worm wheel.
To calculate the efficiency of the lifting machine.
To study the relationship between load, effort, velocity ratio, mechanical advantage, and efficiency