Finding the keyboard operational
willshak entered:

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.

After reading some of the responses I think there may be a misunderstanding.
Are you saying that you want to use your 1/2" electric until you hit a piece
of aggregate and then use the star drill and sledge to break that up? Then
returning to the drill.
If that's the plan then I believe that Home Depot has star drill's or any
decent sized hardware store should have one. If you have a stone and tile
dealer near by I'ld give them a call.
Of course renting or buying a hammer drill is another answer.
Good luck.
Bob

--�
--�
Coffee worth staying up for - NY Times
www.moondoggiecoffee.com