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Need help identifying the weird grind on this drill bit

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Eurekan Offline
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#7
10-21-2016, 04:11 PM
I bought several surplus industrial tools. In the lot was an oddly ground drill bit. Seems this is deliberate but I can find no reference anywhere to this kind of grind. Does anybody recognize it? It sort of like a Forstner bit for metal.  It is a 1/4" drill bit so it was hard to get a good picture. Any ideas?

[Image: 30389151601_7282a2beda.jpg]

[Image: 30358730712_4db7344671.jpg]
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MikeBob Offline
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#8
10-21-2016, 07:33 PM
I am guessing a brad point style of dolling bit. I have some from Vermont Tooling that have a Brad point and a spur on 2 sides.
Cant find them but this is close.
https://www.amazon.com/Vermont-American-...drill+bits
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JGrout Offline
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#9
10-21-2016, 08:00 PM
It appears it may just be a step point done by someone who needed to have one and did not want to buy one 

[Image: Dewalt-Pilot-Point-Drill-Bits.jpg]

the one thing it is not is a brad point drill
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Eurekan Offline
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#10
10-21-2016, 08:14 PM
I've used it once to go through some 14 ga sheet metal and it went through it fast,
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JGrout Offline
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#11
10-21-2016, 09:42 PM
that tends to strengthen my conclusion that it is a custom ground step drill
Let us not seek the Republican Answer , or the Democratic answer. Let us not seek to fix the blame for the past. Let us accept our own responsibility for the future  John F. Kennedy 



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Need help identifying the weird grind on this drill bit


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