When I was cutting into block and concrete I used a side grinder with a diamond wheel to outline the cut and the air chisel to break out the meat but like Tesla says, you need a lot of power. I only have a 1HP compressor with a big tank but I had to chip a while, stop and let the tank fill up and chip some more. If you just had those little sausage tanks on a pancake compressor you would be there a while.
