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Re: Re: Re: Re: Re: Re: Re: Re: Drill Bits
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Posted by Larry Garbarek on July 24, 2000 at 10:32:37 from (152.163.201.68):
In Reply to: Re: Re: Re: Re: Re: Re: Re: Drill Bits posted by Fred OH on July 24, 2000 at 08:20:04:
Fred OH is absolutely right about cobalt drills! Their ability to drill stainless steel and other difficult materials is something worth considering if you are using a drill press and have ways of making a steady set-up. Hand drilling with cobalt drills will cause high levels of drill breakage as cobalt is brittle. M2 HSS drills are less brittle and a better choice for most hand operations. Actually, most HSS drills made in the U.S. are from M7 but that material is so close to the specifications of M2 that only a metalurgist would notice. But, M7 is made again for drill presses and similar production drilling. M50 HSS as offered by Triumph Twist Drill and Hanson Drills may not be as hard as M7 but it is more rugged. Also, Viking/Norseman drills are said to be made of a HSS that is tougher than regular HSS. All of these brands are exported around the world as customers overseas have tried drills from other countries and return to U.S. made drills for their price and quality.
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