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Posted by willshak on October 6, 2007, 7:57 pm
on 10/6/2007 6:05 PM PeterD said the following:
> 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.
I have the small sledge hammer. I just want the hand tool star drill.
I'm not going to try to put it in the electric drill. When the electric
drill with the concrete bit just spins on a bit of aggregate I can use
the star drill to break up the aggregate.
> 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.
>
--
Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @
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Posted by Reed on October 6, 2007, 6:36 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.
>
Try Google
http://www.google.com/products?q=star+drill+3%2F4&btnG=Search&show=li
will get you about 10 to choose from, about $10
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Posted by willshak on October 6, 2007, 7:29 pm
on 10/6/2007 6:36 PM Reed said the following:
> 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.
> Try Google
> http://www.google.com/products?q=star+drill+3%2F4&btnG=Search&show=li
> will get you about 10 to choose from, about $10
Thank you for the direct answer to my question.
--
Bill
In Hamptonburgh, NY
To email, remove the double zeroes after @
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Posted by David Martel on October 7, 2007, 1:14 pm
Will,
This is confusing. I thought you said that you had done a Google search.
If you aren't capable of doing that I think you'll find using a star drill
very challenging.
When I was a kid I tried this in granite. A day's work yielded a hole
about 2" deep. Concrete may be softer but you want to do 40 (?) holes. I bet
your wife is going to laugh a lot and have a great anecdote.
Dave M.
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Posted by RBM on October 6, 2007, 7:13 pm
We pretty much stopped using them in the early 70' but I would expect an
electrical supply to have them. For 40 holes, you'd be better off using a
rental hammer drill. Without the hammer, that blue stone aggregate just
burns up bits
> 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 @
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