Worm gears are helical rolling gears that are categorized as transmission or conversion elements within machine elements.

This type of gear system contains a driving worm and the driven worm wheel. Worm gears are quiet and have a damping effect. They are smaller and easier to operate than spur gears or bevel gears of the same performance and gear ratios.

This wall-mounted experimental unit can be used to study their torque ratios and efficiency. The transmission ratio of the gear can be determined.