Motor repairs

[astroid]

For repairing worn out shaft at bearing seat and worn out bearing housing on end shields of motors 30-300kW, use hot metal spray OR put a sleeve. How does cost compare to performance.

 

[edison123]

Sleeving bearing housing better than metal spraying in terms of cost, repair process & performance.

Metal spraying / sleeving of shafts - Not a good idea.

Muthu

http://www.edison.co.in

 

[electricpete]

I agree with edison on the housings. I have always seen them sleeved, never heard of spraying a housing.

Shafts seem a little trickier. There seem a wide variety of exotic processes that I am not particularly familiar with - we recently had one repaired using "flame spray" which I believe is a good process (it was recommended by a good shop).

edison - what kind of process do you recommend to build up an undersized shaft?

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[electricpete]

By the way edison - I have been calling you Kumar for many years. Now I see your signature Muthu. Was I in left field with Kumar?

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[edison123]

pete

Muthukumaran evolved into Kumar and then into Muthu. At this rate, I will become just M.

As for undersized shafts, my mantra - replace it. Always.

Shaft spraying... sleeving ... been there, done that, got scars to prove it.

BTW, the OP has to investigate the root cause for the shaft journals failing. The cure is expensive ... at least in my clinic.

Muthu

http://www.edison.co.in

 

[electricpete]

Thanks Muthu. Next time I will investigate more closely the technology used for flame spray or other such repairs. I do tend to think there is a wide variety of technologies out there for building up shafts and perhaps the specific technology and the proficiency of the facility with that technology is important. In all cases when we had this repair done, it was not done by the motor shop itself... they sent the rotor to another facility that specified in that repair technology.

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[astroid]

Thanks friends. We used to sleeve rotors earlier but faced frequent problems. Then graduated to metal spray which was expensive but fewer problems but the cost vs performace debate goes on!!!!!