Worm gears (or wormwheel gears) and worms (or worm drives) are created to work Enveloping Worm Gear together to transfer movement between nonintersecting shaft at right angles. Worm gears and worms, which resemble spur gears and screws, respectively, combine to provide a high decrease ratio in a compact gear system. Our ground worm gears and surface worms are engineered for exceptionally smooth and quite operation.