Review on Irwin Tools Cobalt Drill Bit by Jason Man
much better than HSS for harder steels and exotic alloys.
Turned to Kobalt after destroying all of his High Speed Steel (HSS) drills. SS is still extremely difficult to cut because it hardens. I've found that I always get good cuts when using cobalt drills with coolant at lower RPMs. I haven't found any reason why I can't use this for other cutting jobs (something like concrete or tungsten) so I'll take care of that first for now.
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