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Old 04-09-2014, 09:31 PM   #16
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Originally Posted by 4reel View Post
Speed is another important factor. The faster the bit the higher the heat. Heat destroys temper in drill bits.
Basically, your getting higher friction verse cutting.


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Old 04-13-2014, 07:28 PM   #17
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Originally Posted by amakarevic View Post
the Lowe's house brand ?
That is Kobalt (aggravating when people misspell these things. Lowes brand is Kobalt, not Cobalt. Home Depot brand is Ridgid, not Rigid.)

You will usually see cobalt (for metal drilling), titanium (stronger and stay sharper than black oxide), and black oxide (the cheapest).
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Old 04-14-2014, 09:28 PM   #18
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Actually it doesn't bother me at all when the brand names get Ellen wrong, easy enough normally to understand what people mean. Bosch is Bosh, I still know what it means. Cobalt vs Kobalt would be the exception!

To the op, I USED to buy "the best" drill bits but found that for my purposes, medium quality was just fine. Especially in the smaller sizes, 1/8, etc.,you will break the eensive ones as quickly as the cheap ones. So in general I try to match the bit with what I need. That is, if I need to drill a 1/4 inch hole through stainless steel, I could end an hour and kill several cheap drill bits where a cobalt (maybe Kobalt also, but cobalt metal tip) will just zip through. If I am doing wood, crap holes are spade bit while finish holes are forstner bits. Ron
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Old 04-20-2014, 10:51 PM   #19
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Ive been a machinist for 20 years, I also have my own shop.
You always want to look for HSS, next thing is if its surface heat treated (garbage). Most cheaper drills will be coated and surface heat treated. Your correct about cutting oil and low rpm. The step drill works great in thin material (thinner then step of drill).

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