Re: What's the Advantage of Worm Drive Saws??
Here is an example of a worm gear (the bottom one). This one is mated with a pinion gear rather than a helical gear but you get the picture.
If you count the teeth, there are just about 5 teeth on the worm gear engaged with the pinion. That means the worm has to turn 5 times to move the pinion 5 teeth. Or approx 3:1 ratio. That will give the pinion 3 time the torque of the motor but it turns 3 times slower. I believe the motors in worm drive saws are higher speed to make up for that.
Naturally the ratio can be changed by the pitch of the worm screw and the size of the pinion.
Also note the change in direction from the drive (worm gear) shaft to the driven (pinion) shaft.
Hope that explains it.
J.P. Rap Mount Hope Ont.
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