which rotary hammer to use?

[SQLit]

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 than granite.

[klim]

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?

[Robert Allison]

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.

[Sacramento Dave]

I wouldn't even try a roto hammer CORE BORE

[John Grabowski]

Check this link:

[Robert Allison]

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.

[klim]