On Oct 6, 4:24 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.
--
Bill
In Hamptonburgh, NY

Bill, the classic hand held star drills are still available.
Unless you're a masochist, the best thing to do would
be to rent a big SDS hammer drill if you don't own one.
I have a Bosch hammer drill that would make short work
out of 40 holes.

http://hand-tools.hardwarestore.com/...ar-drills.aspx

[8~{} Uncle Monster