Turning down the OD of a gear

[Rauhul Varma]

Originally Posted by magnets

I'm designing a gearbox that would work really nicely if a gear with an OD of 1.700 had an OD that was .020 less. How bad would it be to to turn down the OD of the gear .020? Also, does anybody know exactly the OD of a CIM motor? The website claims 2.54 max, but do they come in under this?

You can expect the Cims to be 2.536" OD. I think turning down the teeth of the gear could work, but you would be shortening the involute profile of the gear which could lead to problems depending on the power moving through the gear.

Originally Posted by EricH

Ah, I see. Maybe move each CIM .010" out from the center, and move the other smaller gear .010" down? Or is there some other space constraint that would prevent that?

That would mess up the center to center distances.