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Motor/Gen Shaft Keyway/Keyseat Tolerance Discrepancy Between Ansi B17.1-1967 and Nema MG 1

Motor/Gen Shaft Keyway/Keyseat Tolerance Discrepancy Between Ansi B17.1-1967 and Nema MG 1

Motor/Gen Shaft Keyway/Keyseat Tolerance Discrepancy Between Ansi B17.1-1967 and Nema MG 1

(OP)
Hey,

Just curious if anyone had run across Table 6 in B17.1 says the width tolerance of square keyways/keyseat for 0.25-0.75" wide was +0 -.002/ 0.75-1.25" wide was +0 -.003". Therefor the keys would be shrunk. There is no direction as to what class of Key is required,Class 1 or 2 on a motor shaft.

While MG-2009

4.9.2 Keyseat Width
3/16-3/4", +.002 -0
3/4-1.5, +.003 -0.

Again no reference to required Key class.

It makes sense that back in the day shrink the keys in would be better for shipping and not loosing the key. Why the discrepancy...?

Thanks,

Papa

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