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Also for CIM
I agree with Paul. A .001 interference is pleanty for such a small torque. In fact we also slid a pinion on the CIM motor with just .001 interference. No need to use the keyway or collars and the keyway slot provides some extra grip.
BTW, just heat the new pinion and it will slide on fairly easily. Just make sure to heat the tool that is holding the pinion and move quickly. Otherwise it will shrink and freeze in place as soon as it touches the shaft.
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Warning: this reply is just an approximation of what I meant to convey - engineers cannot possibly use just written words to express what they are thinking.
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