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Re: Drill Bits
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Posted by BFO on July 21, 2000 at 17:42:00 from (216.208.72.68):
In Reply to: Drill Bits posted by F14 on July 21, 2000 at 09:19:55:
If those are made of HSS, and you use and maintain them properly, they should last. Remember this formula for drilling and machining : rpm =(4 X cutting speed)/diameter of drill where the cutting speed for mild steel is 70-100 (sfm) surface feet per minute. The cutting speed for stainless is 30-40 sfm. For sharpening get yourself a drill gage. They are graduated on the leg so that you can keep the sides the same. Practice, practice, practice. I'm a big fan of the titanium nitrate coated bits, especially for stainless work. But once the coating wears off, you have a normal HSS bit. To give you an example I was able to drill an entire trailer deck with one titanium bit whereas it would take 5 or 6 HSS (21' x 8 1/2', approx. 450 holes). As well after someone broke all my expensive Cobalt bits, the Ti's looked real good for replacements. Keep them cool. For hand drilling, I keep a stick of DoAll Tool Saver, and coat the bit frequently, especially when doing stainless.
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