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Tool Talk Discussion Forum

What kind of drill bit ??

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jCarroll

10-23-2007 06:31:50




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In a tool store I saw a bunch of new drill bits (about 1/4" dia) which had the point exactly reversed from a regular drill bit. In other words, the outside edge of the flute was the deepest point of the bit, and the center was the lowest.. This bit would leave a hole which has a cone pointing "up".

What is the purpose? Does this bit have a special name?

(Not too old to learn some more!)




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jCarroll

10-23-2007 10:33:23




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 Answers to ?? in reply to jCarroll, 10-23-2007 06:31:50  
It's not a spur bit - I know those.

It is not hollow.

It looks exactly like a twist drill for steel, except the sharpening angle is "backwards". the very center of the bit is closer to the chuck end than is the outer edge of the flutes. I can't imagine how it was sharpened - maybe with the edge of a thin carborundum wheel.



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Gerald J.

10-23-2007 11:32:55




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 Re: Answers to ?? in reply to jCarroll, 10-23-2007 10:33:23  
One of these:
McMaster-Carr (www.mcmaster.com) 2926A15 brad point bit. Not too much spur.

McM-C 3051A17 2 flute end mill.

McM-C 2902A19 mortising bit to go inside a mortising chisel.

McM-C 27395A31 up cut spiral routing bit.

McM-C 2891A25 straight routing bit, not for plunging.

McM-C 32175A36 forstner bit without center guide point.

Drills that don't hit first with the middle have to be guided else the first corner that hits will tend to be the pivot for the rest of the drill and then it will drill way oversize.

Gerald J.

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jCarroll

10-23-2007 18:56:15




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 Thx 2 Gerald J in reply to Gerald J., 10-23-2007 11:32:55  
I looked up all your references, and the mortise bit (2902A19) was the closest. however, my bit is about 3" long, and the mortising bits are much longer.

Still not sure what I have, but thanks for your effort to identify mine. There sure are lots of machine tools!



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Gerald J.

10-23-2007 20:32:27




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 Re: Thx 2 Gerald J in reply to jCarroll, 10-23-2007 18:56:15  
That brand of mortising bit was 6" long, but one size on the page in my printed catalog was only 3" long, a small diameter bit. Other brands could be shorter. Look at wood working tool places like Rockler and Augestine.

Gerald J.



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glennster

10-23-2007 10:50:21




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 Re: Answers to ?? in reply to jCarroll, 10-23-2007 10:33:23  
sounds like an interesting bit. maybe some new bit for drilling out spot welds?? whatever its for, seems like the outside of the hole is the purpose for the reverse grind.



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Gerald J.

10-23-2007 08:09:00




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 Re: What kind of drill bit ?? in reply to jCarroll, 10-23-2007 06:31:50  
Spur point, used for wood. Cuts a smoother hole with a nearly flat bottom than the standard metal bit. Usually a plain carbon steel and won't cut steel even if sharpened to the normal 118 degree steel cutting point because its too soft.

Gerald J.



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Chris Vangel

10-23-2007 07:54:05




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 Re: What kind of drill bit ?? in reply to jCarroll, 10-23-2007 06:31:50  
Was the bit hollow? It almost sounds like an end mill or some sort of special machining bit. Did it still have normal flutes to remove the cuttings? Sounds different, maybe it"s the next Superbit to come out, they are always doing something lately.

Chris.



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