CBN cutters

[david]

Using a.5 dia CBN coated cutter and cutting .045 deep to cut threads in a bore, what kind of feed rates would be appropiate? Speeder head with 51,000 rpm is used. Material is S7 @ 52-54 rockwell. Can this setup cut all .045 in one pass at a slower feedrate? Bore is 1.37".

 

Any help will be appreciated.

Thanks in advance.

[jeff]

Is that hard enough for CBN?

My only experience with CBN is on a lathe, and we ran it approx 250sfpm, can't remember the feedrate offhand.