Turbine Wheel Run-Out

Sounds like there may be some play in the tail stock.

Is the tail-stock always mounted in the exact same location on the rail? You could have more runout if the tail-stock was extended more and there was even a slight play.

Also check the condition of the tailstock and bearings if applicable.

How carefully are you controlling perpendicularity shaft/wheel?

Maybe you want to reference the vanes, themselves.

Hi,

You said "Problem not coming continuously some parts are coming with less run out and some are very high".

Mi question is: are you talking about different part numbers? or do you manufacture always the same part? Because if you talk about different part numbers you should check the tooling you use to produce the wheel.

Have you identified the "unbalance" location on the wheel? It is usually located in the same blade orientation?

I have quite experience in SWA (shaft and wheel assembly) process so may be I can help you if you give more details.

It sounds like you are reassembling service experienced parts. I take it you are re-fitting bladed discs to a new shaft?

If these are all new parts then perhaps a review of the blade/disc/shroud production/assembly tolerances is in order.

Need more details to hone a supportive answer.

You are removing the run-out of your wheel with your grinding operation. The run-out on your turbine is dependent on the variation of the set-up process you use in your welding process. It sounds like you need to size (manufacture) the wheel and the shaft with somehow fixturing (centering) the turbine end of your assembly so the grinding process is referenced off the turbine. The turbine is probably the most critical part of your process.

RT Pokin