grinding gray alumina coating(101b-ns)

[erick212]

I am working on a project were we are grinding alumina on a very narrow edge... the problem is we are getting chipping and cracking in the coating on the edges. Is there a recomended grinding parameter for this? Any ideas would help.

Thank you

[TurbineRepair]

Hi Erick,
We spray 101NS on seal teeth edges which are quiet thin. We machine these on a lathe with a very slight feed, about 0.001" a time and fairly slow chuck speed. Nothing special about the tips, just good quality fellas.
It does chip if you try to rush the cut, let all the dust be removed before advancing further in.

I believe the recommended method is to grind with 30-60 grit wheel for roughing and 60-120 grit for finishing. The wheel should be a medium hard, medium dense vitrified-bond silicon carbide wheel.

~Jim

[erick212]

Jim,

Thank you for the relpy, I will try this method.


Erick