The efficiency of a worm equipment transmission is dependent to a big extent on the helix angle of the worm. Multi-threaded worms and gears with larger helix angles have established to be 25% to 50% a lot more effective than solitary-threaded worms. The sliding motion of the worm meshing with or meshing with the worm equipment results in appreciable friction and loss of effectiveness when compared to other varieties of gears. Improve efficiency with hardened and ground worm change bronze worm gears.