Worm gears (or wormwheel gears) and worms (or worm drives) are made to interact to transfer Enveloping Worm Gear movement between non-intersecting shaft at 
right angles. Worm gears and worms, which resemble spur gears and screws, respectively, combine to supply a high reduction ratio in a compact gear system. Our surface worm gears and ground worms are engineered for remarkably smooth and quite operation.
