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I'm installing a firewood rack outside, and want for one side of it to stand on a large stone we have there.

The boulder is irregularly shaped and the metal legs of the rack may slip off -- so I'd like to make depressions in the rock for the legs. The depressions need not be very deep -- I think, half of an inch would do.

I tried applying a chisel with a hammer, and got nowhere -- just a little bit of rock dust flying off. I think, the rock is too hard.

Are there any alternatives? I thought of applying a drill with diamond-tipped "circular saw", but that -- even after I cut a circle -- would still leave the inside of the circle in place, because I'm not going through the rock.

I'm sure, this is a solved problem already -- what's the solution?

  • You are on the right track. Once you cut a circular groove (maybe 1/4 inch), a whack with a chisel sideways (or a few at different angles) will remove most of the center of the circle. – bib May 7 '18 at 1:09
  • Any reason a regular hammer drill with the correct drill bit wouldn't work? – brhans May 7 '18 at 1:10
  • @brhans -- are there stone-bits for hammer drills? I do not have one... – Mikhail T. May 7 '18 at 1:13
  • @bib -- the legs of the rack are rectangular about 1/2"x1", so the circle would need to be about 1.2" in diameter. Do you think, a chisel can just wack such a chunk out? – Mikhail T. May 7 '18 at 1:17
  • A masonry bit typically used on concrete and brick should work. – brhans May 7 '18 at 1:23

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