I'm gonna need to extract, rate these drill bits if you can....

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Re: I'm gonna need to extract, rate these drill bits if you can.... [Re: Bernoulli] #1013566 11/25/10 03:19 AM

Joined: Jan 2000

Posts: 16,227

Bay Area, CA

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My experience with cobalt bits is they are better for drilling very hard substances (stainless, hardened steel, etc.). For mild steel, use lots of coolant and a high RPM - probably about double what one would normally use with high-speed steel bits.

That said, I would think that bolt would be hardened steel but perhaps someone can shed more light here?

Entire Thread
Subject	Posted By	Posted
I'm gonna need to extract, rate these drill bits if you can....	Rafterman191	11/23/10 08:52 PM
Re: I'm gonna need to extract, rate these drill bits if you can....	off-roader	11/23/10 10:13 PM
Re: I'm gonna need to extract, rate these drill bits if you can....	mineitnow	11/24/10 12:46 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	hazy_daze	11/24/10 04:02 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	bretwalda	11/24/10 08:28 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	Bernoulli	11/25/10 01:11 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	off-roader	11/25/10 03:19 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	Bernoulli	11/26/10 04:32 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	Rafterman191	11/24/10 04:26 PM
Re: I'm gonna need to extract, rate these drill bits if you can....	fasteddy	11/24/10 08:58 PM
Re: I'm gonna need to extract, rate these drill bits if you can....	Mo95sr	11/25/10 10:57 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	Rafterman191	11/26/10 05:30 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	sasnydley	11/26/10 04:15 PM
Re: I'm gonna need to extract, rate these drill bits if you can....	Kevin C	11/26/10 06:29 PM
Re: I'm gonna need to extract, rate these drill bits if you can....	fasteddy	11/27/10 02:38 AM
Re: I'm gonna need to extract, rate these drill bits if you can....	Rafterman191	11/28/10 06:15 AM

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