GT and All,
I wish I could speak with more than knowledge that it "just was done", But it was a secret process at the time I was working at NASA.
I do know that there was some work done with the "titanium nitride" tool coating process.
It must have shown some evidence of sucess as one of our NASA Researchers obtained a government patent on the process of "Ti N" tool coating for tool wear resistance.
With 25 years having passed I am not sure that the same processes are now in use for mass production tool manufacture.
viggo
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