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Topic: Need advice on special replacement motor
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Stephen Furley
Film God
![](http://www.film-tech.com/ubbmembers/1277b.jpg)
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 04-09-2008 01:26 AM
Sleeve bearings should be lasting longer than that. We have large fans up in the roof space of our college doing the same job; there are four wings in the building; the plant in one of them was replaced two years ago, the rest is original, but about to be replaced. They are sleeve bearings, and I don't think they've been replaced since the place was built, in the late '50s. They certainly haven't been replaced in the eighteen years that I've been there. It sounds like something is wrong with your system, incorrect clearance between shaft and bearings, poor lubrication, shaft out of balance, worn shaft or poor quality bearings.
I haven't seen a standard motor of that size with a shaft anything like that long. I suppose you could make up an extension shaft for a standard motor, but you'd really need to turn it between centres, case harden it, and then finish by grinding between centres, while mounted on the motor shaft, to get it really accurate. The case harding would need to be deep enough to not be removed by the final grinding, so not something you with a solid box type system; you'd need a cyanide bath or reducing gas atmosphere furnace; it sounds like a lot of work.
Have you considered trying to obtain ball or roller replacement bearings for the existing motor, or what may be the best solution, replace the whole fan assembly with a modern one? Even if the existing ductwork is a non-standard size it would be a fairly simple job to make up suitable adapter ducts to fit a standard fan; any HVAC contractor would be able to do this. You're talking about a standard supply, so obtaining a new fan assembly to run on it wouldn't be a problem.
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