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Posted by Kevin in Ohio [64.136.27.228] on Wednesday, February 09, 2011 at 14:23:12 :
In Reply to: OT cutting a hole in a concrete wall posted by David Sherman [72.47.9.228] on Tuesday, February 08, 2011 at 20:09:23 :
If you use a big cicular saw style be prepared to have LOADS of dust everywhere. If your in an enclosed area get a GOOD mask and something that completely covers your eyes. They are bad enough outside but inside would be pretty crazy. You're going to look like the Pilsbury dough boy!
I've done them the slow way with star chisels too. Worst one I ever did was filled with black granite rocks. Concrete seemed like warm butter compared to those things.
You can ge6t pretty straight lines by drilling evry 4 to 6 inches and use slip wedges in the holes. Slowly, lightly tap them till it breaks off but abbout 12 inches is the thickest I've personally done with that method. Let us know how you make out.