Describe the main operating features of any one of the following: Worm and wheel mechanism - Leaving Cert Engineering - Question i - 2016

The worm and wheel mechanism consists of a worm (which resembles a screw) and a gear known as the wheel. The worm drives the wheel, effectively converting rotational motion into linear motion, typically allowing for a change in the direction of rotation by up to 90 degrees. This arrangement is advantageous for applications needing high torque and reduced speed. In projects involving DC motors, this system is often utilized to manipulate the motor speed and torque output effectively. Notably, it is designed to lock the system in place when no external force is applied, thereby maintaining the position under load.