NEMA Motor Shaft Dimensions and Tolerances

Probably the manufacturer's web site, which you don't share.

Last resort: Pick up the phone and call them!

You can get it free from the horse's mouth - you do have to register, but it's free.

Thanks, but it only gives dimensions, no tolerances. Refers to MG 1, 4.9 for tolerances but I cannot find it anywhere on the website.

The drawings in the list linked in #1 are toleranced.

The shaft and keyway is not toleranced. Just says standard NEMA tolerance.

http://www.baldor.co.jp/image/pdf/SHAFTKEY.pdf

Thank you so much! Just what I was looking for.

That's the tolerances on the keyway, not the shaft. You probably need to purchase the full standard - the freebie is condensed. Most of the time, we are installing sheaves, sprockets, couplings, etc. and depend on the manufacturer to ensure the tolerance is proper.

I suspect it is +0.000/-0.001 as in EASA AR100-2010.

This document has the shaft tolerances buried inside somewhere:

http://fac-web.spsu.edu/ecet/wagner/MG1cond.pdf

That's also a condensed version. As noted in it "This is a condensation of the standards on motors included in NEMA Standards Publication Motors and Generators, MG 1-2006. . . The numbers placed at the end of many of the paragraphs in this condensation (e.g. MG 1 Part 6) refer to the complete standard in MG 1."

Good job!

Try this:

http://www.engineeringtoolbox.com/nema-electrical-motor-frame-dimensions-d_1504.html

I was just looking for keyway standards and I came across this.

for

• NEMA Standard thru 6.500 DIA
• Navy MIL-M-17060E(SH.) thru 3.250 DIA

This is off a Baldors site.

Baldor has always been a good site since the 90's. With the exception of the hiccup with the Dodge/Reliance partnership... which was a mess.