I'd like advice on which electric rotary hammer or hammer drill to use
for drilling approximately 100 2" holes in granite 6" deep in which to
set steel T-posts. The job site is rough terrain and it would be
easier to get a generator there than a compressor so would like to use
an electric drill if there is an affordable one that could handle the
job. Any suggestions?
Having drilled concrete and rock several times I personally would be looking
into a rock drill, and a BIG air compressor. I used to drive a line truck
with an air compressor and a 70 pound air hammer. It would do the job, in
time. When drilling granite a 90 pounder would have been a lot easier to
drill. Lugging from hole to hole well..........
I believe trying granite with a core and electric tool is next to worthless.
I also believe that 6 inches for a fence post is not near deep enough. An
air hammer with 2 inch bit will remove the material as you drill. With an
electric hammer you WILL have to chip out the core at least 3 times before
you get to 6 inches. Ever inch you go into the granite will be harder and
harder to remove the cores. If you buy a 2 inch drill you will run the risk
of having it get stuck. (done that before)
I would not try what you describe with an electric tool. I own a TE-52 and
TE-22 the 52 can core up to a 3 inch hole in concrete, which is a lot softer
That sounds like a job for a Hilti core bit machine or a Hilti
rotary hammer. Granite is hard and you will need a machine
that will perform. You are going to pay out the nose for a
machine like that though.
You can rent these machines at a lot of rental places. I have
a fairly light duty model (the TE-55) and it was a thousand
dollars. The core bits run about 200 bucks each.
I wouldn't either, but that is not what the poster asked.
To the OP:
You are getting good advice from the other responses. I would
not try to do this with electric tools. I tried to answer
your question, but I don't think that electric is the way to
go, either. I would definitely go with an air tool for this job.
Thanks for your advice. I think I'll drop the electric option and take
my neighbor up on his offer to use his mammoth air compressor on
wheels and drill and invest in 300' of hose. I think you guys saved me
a lot of headaches.
On Sun, 23 Oct 2005 14:12:05 -0400, "John Grabowski"
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