Electric Motor Shaft Tolerance

Why do you think a particular tolerance is chosen? What factors do you think are related to the space between two parallel, rotating surfaces in a motor?

What is your experience level, then?

I don't know what you are really after, but if your plans including selecting and buying a motor, I'd take a motor person out to lunch.

Why would you need a special combination of shaft tolerances if you don't understand why tolerances are chosen in the first place.

Ask a motor supplier to help you, and tell him what you are doing, which you have not done here.

I understand why different tolerances are choosen eg general engineering, structures, production of semi products and am working in the motor industry. I know I have to choose a IT5 to IT12, there is nothing that says which particular grade to choose. It is a motor that is under repair with no OEM data other than a previous same motor was repaired with no given tolerances.

Does the motor have a nameplate?

I think the dimensions are already specified in motor manufacturer association standards such as NEMA. [?]

Tornado, Lyn

Thanks for your review, I have managed to get toloerances from SKF Catalogues. As I stated previously I have to go off an Australian Standard, and NO I am not over thinking but thanks for your concern.

Once again thanks for your efforts.