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Unread 02-07-2013, 16:16
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Re: pic: 3 CIM PTO With Break

In FRC a lot of people use the following formula to calculate gear center to center dimensions:

C to C = ((N1 + N2) / (2 * DP)) + .003

N1 and N2 are the number of teeth in the two gears you're meshing, and DP is the diametrical pitch of the gears (which in your case is 20).

See this thread for more info:
http://www.chiefdelphi.com/forums/sh...ad.php?t=95413
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Unread 05-07-2013, 13:24
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Re: pic: 3 CIM PTO With Break

we had something similar to that this season we had a 3 cim pto with a two speed and also a brake.
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Unread 05-07-2013, 15:28
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Re: pic: 3 CIM PTO With Break

Screws aren't really meant to take shear force, nor are they intended to locate features. If you use a large center hole for the CIM, the hole will no longer be able to constrain the motor as intended. Depending on how large your clearance hole for the 10-32 mounting screws is, you could end up with as much as .005" of play in either the closer or farther directions. This is obviously optimal for neither gear efficiency nor backlash, and completely mitigates the effect of adding .003" between gear centers. You should really reconsider the benefits of a large boss hole, and whether or not they outweigh the negative consequences.
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Unread 07-07-2013, 19:56
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Re: pic: 3 CIM PTO With Break

Quote:
Originally Posted by splatter View Post
we had something similar to that this season we had a 3 cim pto with a two speed and also a brake.
Yup. Saw that at the NYC regional and as the driver for my team, I wished I had one. So I made one lol.
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