Star drill?

Posted by willshak on October 6, 2007, 5:24 pm

X-posted to other relevant group.

Before there were concrete drill bits, or electric drills for that
matter, small round holes in concrete or rock were made by a round
chisel type tool that was pounded into the stone with a small sledge
hammer while turning the tool. It might have been 8" or 10" long. The
face of this chisel had a star-like pattern, only with 4 points, like a
plus sign " + ". I believe it was called a star drill.
A Google search brings up a lot of sports drills (training regimen).
Anyone know if they still make them, or if so, where to get one on-line?
I'm trying to drill some 40 - 3/4" holes in concrete and my 1/2" corded
electric drill with a concrete bit stalls on the stone aggregate in the
concrete requiring me to stop and try to crack the aggregate with a
large punch. I figured a star drill would work better.

--

Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @

Posted by George on October 6, 2007, 5:47 pm

willshak wrote:

> X-posted to other relevant group.
>
> Before there were concrete drill bits, or electric drills for that
> matter, small round holes in concrete or rock were made by a round
> chisel type tool that was pounded into the stone with a small sledge
> hammer while turning the tool. It might have been 8" or 10" long. The
> face of this chisel had a star-like pattern, only with 4 points, like a
> plus sign " + ". I believe it was called a star drill.
> A Google search brings up a lot of sports drills (training regimen).
> Anyone know if they still make them, or if so, where to get one on-line?
> I'm trying to drill some 40 - 3/4" holes in concrete and my 1/2" corded
> electric drill with a concrete bit stalls on the stone aggregate in the
> concrete requiring me to stop and try to crack the aggregate with a
> large punch. I figured a star drill would work better.
>

Thats what hammer drills are for and also the reason why star drills are
not so popular.

Posted by Glenn on October 6, 2007, 5:54 pm

Obviously you have never used a star drill.

Forget it. You will use the electric drill only, after
about 15 min of pounding on the star drill. Maybe you
are pushing it too hard. I usually drilled a 1/4" hole
and then drilled it out bigger with the 1/2" or
whatever.

> X-posted to other relevant group.
> Before there were concrete drill bits, or electric
> drills for that matter, small round holes in concrete
> or rock were made by a round chisel type tool that
> was pounded into the stone with a small sledge hammer
> while turning the tool. It might have been 8" or 10"
> long. The face of this chisel had a star-like
> pattern, only with 4 points, like a plus sign " + ".
> I believe it was called a star drill.
> A Google search brings up a lot of sports drills
> (training regimen).
> Anyone know if they still make them, or if so, where
> to get one on-line?
> I'm trying to drill some 40 - 3/4" holes in concrete
> and my 1/2" corded electric drill with a concrete bit
> stalls on the stone aggregate in the concrete
> requiring me to stop and try to crack the aggregate
> with a large punch. I figured a star drill would work
> better.
> --
> Bill
> In Hamptonburgh, NY
> To email, remove the double zeroes after @

Posted by willshak on October 6, 2007, 7:27 pm

on 10/6/2007 5:54 PM Glenn said the following:

> Obviously you have never used a star drill.

Obviously, you don't know anything about me.

> Forget it. You will use the electric drill only, after about 15 min
> of pounding on the star drill. Maybe you are pushing it too hard. I
> usually drilled a 1/4" hole and then drilled it out bigger with the
> 1/2" or whatever.

>> X-posted to other relevant group.
>> Before there were concrete drill bits, or electric drills for that
>> matter, small round holes in concrete or rock were made by a round
>> chisel type tool that was pounded into the stone with a small sledge
>> hammer while turning the tool. It might have been 8" or 10" long. The
>> face of this chisel had a star-like pattern, only with 4 points, like
>> a plus sign " + ". I believe it was called a star drill.
>> A Google search brings up a lot of sports drills (training regimen).
>> Anyone know if they still make them, or if so, where to get one on-line?
>> I'm trying to drill some 40 - 3/4" holes in concrete and my 1/2"
>> corded electric drill with a concrete bit stalls on the stone
>> aggregate in the concrete requiring me to stop and try to crack the
>> aggregate with a large punch. I figured a star drill would work better.
>> --
>> Bill
>> In Hamptonburgh, NY
>> To email, remove the double zeroes after @

--

Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @

Posted by PeterD on October 6, 2007, 6:05 pm

wrote:

>X-posted to other relevant group.
>Before there were concrete drill bits, or electric drills for that
>matter, small round holes in concrete or rock were made by a round
>chisel type tool that was pounded into the stone with a small sledge
>hammer while turning the tool. It might have been 8" or 10" long. The
>face of this chisel had a star-like pattern, only with 4 points, like a
>plus sign " + ". I believe it was called a star drill.
>A Google search brings up a lot of sports drills (training regimen).
>Anyone know if they still make them, or if so, where to get one on-line?
>I'm trying to drill some 40 - 3/4" holes in concrete and my 1/2" corded
>electric drill with a concrete bit stalls on the stone aggregate in the
>concrete requiring me to stop and try to crack the aggregate with a
>large punch. I figured a star drill would work better.

I'm 100% sure they are available, but I really don't think many 1/2"
corded drills will do much for you.

These are impact, so you need an impact tool.

I use an IR tool that uses star bits, works nicely (but is air
powered!) I know you can rent electric ones (or buy, but they are
expensive).

But using a star drill in a standard drill won't do you any good,
you'll never really make a hole--you have to have impact. BTW, with my
IR tool, I provide the rotating force, the tool only provides the
impact. And if I don't provide rotational force, things get very
strange after a short while! (I usualy do a continous 90 degree
rotation back and forth as I'm drilling...)

And, yes, the star drill will work better. I punch 3/4" holes about
three inches deep in about a minute or so per hole.

Try a tool rental place. Tell them what you need, they will have
something to do it.

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