Worm Gear/Spur Gear
Worm Gear/Spur Gear
(OP)
Does anyone know if it is possible to get a worm gear mechanism to work using a spur gear. I am just trying to make a small model of a worm gear out of acetal plastic for demonstration purposes only. I am thinking it might work as long as the pitch on the lead screw, is the same or a little larger than the pitch on the spur gear. What do you guys think?





RE: Worm Gear/Spur Gear
If the shafts need to be at 90deg you'll have to use a helical gear which has the same lead/helix angle as the worm's.
If you're cutting the gear in a milling machine it's actualy easier cutting a worm gear rather than a helical.
Another option is if you you end up screw cutting the worm and using a standard acme type of pitch and happen to have a tap the same pitch and slightly larger diameter than the worm, you can actualy "hob" the gear in a milling machine or even a lathe.
RE: Worm Gear/Spur Gear
RE: Worm Gear/Spur Gear
Therefore if you mount a 10 degree lead angle (80 deg helix angle) worm and a spur gear (0 deg helix angle) they must be mouonted at 80 degrees to function properly.
This is a technique which is widely overlooked in todays gearing world.
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