pic: Single Speed Gearbox Iterations

[PAR_WIG1350]

Originally Posted by AdamHeard

I'd have to confirm this, but an undercut shouldn't be any less efficient. It just needs the tooth to be reduced in size near the base to prevent impact of teeth; the involute surface should still be maintained.

It really is a substantial strength decrease; but as shown by numerous robots running them they are still strong enough.

In the first stage of a gearbox the force would be lower than it would be in later stages so the effect is minimized, identical gears in later stages might not fare as well. This is why the gear teeth in the fisher price gearbox get larger with each successive stage.

[AdamHeard]

Originally Posted by PAR_WIG1350

In the first stage of a gearbox the force would be lower than it would be in later stages so the effect is minimized, identical gears in later stages might not fare as well. This is why the gear teeth in the fisher price gearbox get larger with each successive stage.

I'm not sure what you're getting at with this post, this matches what I said about increasing toothsize as you go further in the stages.

EDIT: Reread, you're referring to the undercut gears not the plastic gears. Your Point is valid.

[roystur44]

Suggestion,

A couple of pressed in stainless steel guide pins would make this baby slide right in/out and align to the mating shaft and frame. Using guide pins can reduce the number of bolts to the frame and provide a accurate fit.

See how a car transmission bolts to a engine. Usually a couple of pins on the bell housing that mate to blind holes on the engine. The pins help to align the shafts and just a couple of bolts to hold the transmission on.

Roy