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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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