Recently in an auction I bid on a skid of stuff, some of which I wanted and others I didn't pay attention to.
Won the lot and started sorting.
Ran into this thing
Not showing is the bottom which has a round hole in it.
Anyone?
Recently in an auction I bid on a skid of stuff, some of which I wanted and others I didn't pay attention to.
Won the lot and started sorting.
Ran into this thing
Not showing is the bottom which has a round hole in it.
Anyone?
Marc Britten wrote in news: snipped-for-privacy@gSPAMmail.com:
It's a trepan drill. Or hole saw or BTA drill depending on where you are from.
It is used to drill large holes in plate. It takes less power to drill a large diameter than a conventional drill, and leaves a slug which can often be used to make something else.
D. Murphy is right.
Masonary core drill. You need the arbor that goes with it, and the pilot drill.
The hole saws that I'm familiar with are much much lest robust that this thing appears to be, which is why I was a bit confused I guess.
I was guessing concrete, like many others here. What makes you so sure its a metal drill?
While I'm on the subject of what the....
I also just found 2 "taps" (labeled 10-32) they look almost like drills with thread cutters on the ends.
I know I'm a rank beginner at this stuff but I've never seen a tap like that before.
It is a annular cutter used to cut holes in metal. They work like a hole saw in that the produce a center slug. The advantage is that they require much less power to drill a hole than an equivalent sized twist drill and produce a better hole than a hole saw. Magnetic drills such as those made by Hougen use the same type of cutter. I am almost sure it is not a concrete core bit in that the carbide tooth geometry is wrong for concrete.
This sounds like "spiral flute taps", see
Regards, Bob Headrick
I agree
Gunner
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Theodore Dalrymple,
Marc Britten wrote in news: snipped-for-privacy@gSPAMmail.com:
I've changed my mind. It's a concrete hollow hammer core bit.
It looks like a metal cutting drill, but the angles on the front of the carbides looks very negitive, and there is no route to evacuate the chips?? So it could be a concrete bit.
i've changed my mind too!
Could be a "Drap", a combination drill & tap in one tool. See
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Cool! I learn something every day!
Gunner
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Weird, my eyes must have glazed right over that option, I actually went to MSC to try and figure it out.
Thanks for helping me.
Hello, Marc! You wrote on Mon, 10 Jul 2006 17:55:57 -0500:
MB> Won the lot and started sorting.
MB> Ran into this thing
MB>
MB> Not showing is the bottom which has a round hole in it.
Concrete core cutter - as it says on the label. Used for extracting cores for testing suspect concrete compression strength.
With best regards, mweb. E-mail: snipped-for-privacy@home.com
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