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#1
04-02-2012, 08:54 AM
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Drilling Hard Steel help
Can someone help me out with drilling 3/16 holes in hard steel? I'm using tin coated bits with oil and slow speed and they are screeching and dull/breaking. My drill speed is slow, cutting oil is used. I heat to critical and cool the steel. then grind and shape. It's the small holes holes that are problems
I switched to cobalt drills. It made it easier but I can tell they won't last long. Any opinions on going to solid carbide spade bits? 
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| blade, knife, knife making, steel |
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