pin size
pin size
(OP)
Hi
I just stub a shaft in an electric motor(old shaft was bent), and I was wondering what size cross pin I should use.
The stub is 60mm in diameter and it goes into a shaft that has been bored out for a slide fit on the 60mm stud and the OD of the female end is 78.5mm.The lenght of engagement is 63.5mm
The electric motor is 35hp.
thanks
eddie
I just stub a shaft in an electric motor(old shaft was bent), and I was wondering what size cross pin I should use.
The stub is 60mm in diameter and it goes into a shaft that has been bored out for a slide fit on the 60mm stud and the OD of the female end is 78.5mm.The lenght of engagement is 63.5mm
The electric motor is 35hp.
thanks
eddie





RE: pin size
What is the maximum torque that can apply on the motor shaft?
Knowing these values then basic double shear analysis on the pin can give the desired pin diameter and if it possible at all.
From the fact that the shaft was bent I assume that there is a bending moment too. This will complicate the pin calculations a little bit more.
RE: pin size
Not sure on the motor shaft, but it machined like C1020.
I made the stub from 4140 HTSR
"What is the maximum torque that can apply on the motor shaft?"
Not known, just that it is 35 hp.Job from a local rewind shop.
The motor shaft got bent when it was dropped!!
Hope this helps.
www.geocities.com/motorworksnf/123
RE: pin size
If you want to also use a pin I would use one 10mm or less due to the wall thickness.
Barry1961
RE: pin size
regards
John
RE: pin size
There may be some issues with eddy currents with a stub shaft.
Barry1961
RE: pin size
Before you pin, shrinkfit or bond your shaft to the motor you need to know the maximum torque the motor can deliver.
Only then can you decide pin size etc based on the material
you intend to use. (echoing israelkk sentiments)
regards
Desertfox
RE: pin size
RE: pin size
If you don't have the facility for doing this, give it out to any reputable machine shop.