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Shafts and Couplings - Which has a standard dimension ? 1

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edison123

Electrical
Oct 23, 2002
4,413
IN
I have a broken motor shaft to be replaced with a new one but the motor coupling, which is also damaged, has not been sent to my shop.

Which part has the standard diameter for the interference fit?

1. Shaft dia - 125.00 mm and Coupling dia < 125.00 mm

or

2. Coupling dia = 125.00 mm and Shaft dia > 125.00 mm.

Any links to standards will also be appreciated.

 
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Thanks RCHandy. This is a German make. I know bearings have a standard bore and the shaft has the interference. I was wondering if it applies to the couplings also.
 
Thanks RCHandy.

And idea where I can look up those tolerances ?
 

You need to now your shaft size and the IEC dimensions will give a tolernce spec, for example "J6"

The shaft and bore tolerances for J6 can be found in Machinery's Handbook
 
Seems logical that the motor shaft would have the standardised dimension across all manufacturers with couplings bored to suit the motor shaft.
 
Sorry about my first post. The tables in the links are OK.
- I did some more research . The interference fit for cylindrical shaft ends is found under DIN 42946 as follows:

Shaft 125.000 m6 = +15/+40 (+0.015 to +0.040)

The coupling should be H7 = 125.000 0 to +40 (0.040)
 
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