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Shafts and Couplings - Which has a standard dimension ?

Shafts and Couplings - Which has a standard dimension ?

Shafts and Couplings - Which has a standard dimension ?

(OP)
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.

 

RE: Shafts and Couplings - Which has a standard dimension ?

(OP)
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.

RE: Shafts and Couplings - Which has a standard dimension ?

(OP)
Thanks RCHandy.

And idea where I can look up those tolerances ?

RE: Shafts and Couplings - Which has a standard dimension ?


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

RE: Shafts and Couplings - Which has a standard dimension ?

Seems logical that the motor shaft would have the standardised dimension across all manufacturers with couplings bored to suit the motor shaft.

RE: Shafts and Couplings - Which has a standard dimension ?

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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