This Winch Crab – Single Purchase is a strong and reliable mechanics laboratory apparatus used to demonstrate the working of a single-purchase lifting machine. It is specially designed for experiments related to mechanical advantage, velocity ratio, and efficiency.

The apparatus is fitted with a 25 cm diameter grooved wheel and precision machine-cut gears for smooth transmission of motion. The complete mechanism is mounted on heavy-duty cast iron wall brackets, providing excellent strength, stability, and durability during laboratory use.

Its robust construction and smooth operating mechanism make it suitable for schools, colleges, universities, and engineering laboratories for practical demonstrations of simple machines and lifting systems. Supplied without weights.

Experimental Objectives

To demonstrate the working principle of a single-purchase winch crab.
To determine the mechanical advantage of the apparatus.
To determine the velocity ratio of a single-purchase winch crab.
To study the efficiency of a lifting machine.
To understand the relationship between load, effort, mechanical advantage, velocity ratio, and efficiency.