Way back when some friends and I generated a bid for 8' cyclone in
extremely rocky soil. A California company came in 40% lower than
any other local outfits. We went out to laugh thinking they would
not be prepared for local soil conditions. They had a heavy steel
dome, inserted approximately 1/4 stick of dynamite. When the
charge went off, the lid was upside down next to the hole ready
for the next load and the hole was clean to the bottom waiting for
the post and concrete.

Don't ever assume the low bidder is nuts. These guys went all
over the world setting fence.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing. . . .
DanG


"klim" wrote in message
...
I need to drill many (50 to 100) 1 1/2" diameter holes 6" deep
in
solid rock for steel T-posts for a fence and I haven't decided
how to
go about it.

What type of bit/drill combination would be most cost effective?
Electric drill (size?) with core bit?
Pneumatic drill with impact bit?
Other combo?

The location is far from power so the job would require a
portable
generator or a compressor if a pneumatic drill was used.

I have a 2hp 20 gallon compressor - would be sufficient to run a
pneumatic drill to drill the 1 1/2" holes?