Subject: Re: drill bits

From: Michael Horgan <[email-masked]>
Date: Thu, 8 Aug 1996 17:43:56 -0700

At 11:51 PM 8/6/96 -0600, you wrote:
>On Tuesday, August 6, Roger Olsen said.
>>I have found better life and cleaner cuts with the bullet pilot point bits
>>than with the  genaric standard high speed twist drills, but longest life
>>with the carbide tip. i have never had a solid carbide bit, or a cobalt
>>bit. can someone comment on these types and or add other styles, makes, or
>>suppliers to this discussion.
>
>Thanks for the tip on the bits, (no pun intended). Have you looked at the
>MSC big book? Must be 200 pages of bits! Feeds my bit fetish.
>
>I'd like to know how best to sharpen bits. I have honed them with a diamond
>lap stone for fine sharpening. Also, I've held them at the recommended
>angles to my bench grinder, which works, but can eat 'em up pretty fast.
>These bit sharpeners that you see at Northern, has anyone used them? Are
>they worth $50 or whatever they cost? I don't go through a lot of bits but
>it would be great to sharpen them up faster.
>
>--
>David
>http://www.flash.net/~dwwilson/
>[email-masked]
>
Darex has a new drill bit sharpener coming out. Price around $150. Called
the Drill Doctor. Supposed to be selling it to the stores at the National
Hardware Show in Chicago.
Check it out at Darex.com. 
It's a little expensive, but it makes drills better than new.
Michael D Horgan  [email-masked]  	|   The Gene Pool
http://members.aol.com/lughaid/      		|    Could use
[email-masked]       			       	|     a little
[email-masked],    [email-masked]    	|     Chlorine!

---

From: David Wilson <[email-masked]>
Date: Fri, 9 Aug 1996 15:32:11 -0600

>>>suppliers to this discussion.

I really like centering drills. The don't bend like small twist drills.
They also cut a great countersink. One way I use them is:

1. Scribe your mark with a carbide scribe.
2. Punch w/automatic centering punch.
3. Use small centering drill to start the hole, gradually work up to a
larger size. This way, if you're off a little, you can move over to start
another hole.
4. Then, with a twist drill, you can drill into your started hole without
it walking.

I used to try and hit a center punched dimple with my final (large) drill
size, but runout of my drill press would usually walk away from it.

BTW, thanks to Michael D Horgan, and Steven O. Smith, for the great info on
the Darex Drill Dr.