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Yes please olympic, the more information I can gather the better. Cheers.

For this type of fit I would say it's not possible.

Thanks for the info mrainey. however this link only relates to the tooling, the area where we are experiencing problems is the actual stellite itself. On some of the rings the stellite is flaking away from the base material (stain.s 316). I wondered whether our machining parameters were...

It's machining an offset cone profile on the I/D of a seat ring for a butterfly valve and mounted on a vertical borer. I'm positive we've got the correct tip tool which is Tungsten carbide with a 2 degree max positive top rake and minimal radius at the point.

Anybody know the parameters for machining PTA stellite #6? Speeds/feeds etc. I reckon it's about 0.25m/sec and 6-8 cuts per mm with a soluble cutting oil. Would anyone agree/conflict with this?

It all depends on the application and the size/shape of the component and what the tolerances are.