Drill bit or something else???

random_farmhick · Dec 1, 2010

I got a box of dill bits, taps, and reamers and was going through it and come across something kinda strange, It reminds me of a drill bit but i'm not sure... Its hard to tell from the picture but its tapered along the whole way. Anyone ever run into something like this and what its used for???

Lou from Wi. · Dec 1, 2010

CEMENT DRILL.FOOTING ANCHOR drill bit FOR STUD BOLTS. RE-ROD HOLES. ETC.
LOU.

Lamar Fudd · Dec 1, 2010

It's tapered because its worn. Generally you don't use the entire length of the bit so it gets wear on the flutes. If a deep hole was drilled in concrete with this bit, it would bind up.

random_farmhick · Dec 1, 2010

I was looking at them closer, and they all have the same degree of taper, and they all are left handed... Just thought kind of strange. I do have one new one in the bunch and it still has a taper to it??? But at least I have an idea on what they are used for. How do they start the hole because they are just a point on the end, the flute doesnt go all the way.

Anonymous-0 · Dec 1, 2010

It looks quite large. If it ws only 4-6 inches long I would think it was a taper pin reamer. They were used in the past to to fasten collars, gears , etc. on shafts. First a hole was drilled, then taper reamed and then the tapered pin was driven in. It was always fun driveing them out, because sometimes you couldn't figger out which was the small end.

Areo

TimV · Dec 2, 2010

I'd lean toward Aero's assessment that it's a taper pin reamer, though it would be helpful to see the end--does it have a square shank that would indicate it fits in a tap wrench? It might not, but if it does, that would be one more indication that we're on the right track. I'd be skeptical that it's a masonry drill--typically those have a carbide insert on the tip. Not to say it couldn't be, but if it is, it's unlike any masonry drill I've ever seen.

William Eccles - Jardine · Dec 2, 2010

Dear Sir:
I would tend to agree with the last writer. Having been trained in
the machine tool trades years ago this bit reminds me of the taper
reamers we used. The reason for the left hand twist is so that the
tool will only remove the necessary amount of material and leave a
smooth / polished hole/ not rough like a drill bit.
Wm.E.J.

Anonymous-0 · Dec 2, 2010

They were very hard to drive out even when you did know which end was which. Any included angle fastener less than 13 degrees is almost impossible to get apart.

guido · Dec 2, 2010

Hello
Here is a reamer drill bit.
It starts tapered , and finishes the hole straight.
Guido.

Spook · Dec 2, 2010

The first one is a masonary bit.

Drill bit or something else???

random_farmhick

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Lou from Wi.

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Lamar Fudd

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random_farmhick

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Anonymous-0

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TimV

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William Eccles - Jardine

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Anonymous-0

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guido

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Spook

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