Rekd,
I've heard about hole popping. The other day i had to drill a 5mm starthole 165mm deep through a piece of titanium. I was allowed 0.5mm runout. I managed to get it right! Took nearly 2 hours to drill that hole....
Yes gun drilling would be my choice.
Klox
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*** KloX ***
I'm lazy, I'm only "sparking" when the EDM is running.... |