Relation Between Motor Coupling Spacer Length and Torque

The spacer may be there for the purpose of removing the shaft seal without disturbing the motor and pump mountings. A shorter spacer may not accommodate this. Maybe you could cut the excess length off the motor shaft?

If you acquired a replacement of the same frame size the shafts should be the same lengths. If not then the OEM had the shaft modified. I would then question what other modifications to the motor were made for the application.

We don't even know if it is an equivalent motor. Could be anything. Machining couplings, if done properly, is not rocket science.

When I worked in the wet process industry, we not only machined our own couplings, but we built our own impellers, from 316L steel, Titanium, Hasstelloy C-276 among other things. And the plastic housings for these pumps. This was in addition to the hundreds of commercial pumps we used.

Done properly, no problems.

I wouldn't take any bets on the success of this particular project.

The ease of fabricating the coupling is not the point I was trying to bring up. Any change from the normal specs on a frame size is usually done for a reason. If he used the specs off the motor name plate and the new motor matches them. I would look closer to why the modification was made.

Right answer.

The only thing I would like to assume is the people that ask questions here have some clue as to what their doing. I don't take the stance that no one does like some.

And if they don't have a clue maybe the information I put forth will help.

I commend you for your noble stand, and your generous assumption.

Brief and concise answers are:

1. Would have been easier if the change wasn't made.

2. No

3. No

Good Luck, Old Salt

Remember Good Question = Good Answer Poor Question = Poor Answer

Dear Mr. ppremram,

Yes. The Distance between the Motor and the Driven Equipment can be increased to a very small Extent, provided, the VIBRATION and DEFLECTION aspects on account of Residual Un-Balance Forces in the Distance Piece is TAKEN CARE OF and are WITH-IN the LIMITS.

DHAYANANDHAN.S