How do I make a hole in concrete?


interesting mention chisel. old miners used "star drill", chisel 4 or 6-point star on tip, cut holes in rock (usually dynamite). each blow of sledge need rotate chisel little didn't become wedged tight. when twelve years old, indentured 7th-grade industrial ed. teacher (i "teacher's aid") drill holes in concrete wall of school's basement shop mount tool shelf expanding lead anchors , lag bolts. took me hour hammer hole make in few seconds sds drill.

i want make 1/2" round hole 1 1/2" deep, mount bolt either in hydrualic cement or epoxy, in connection fastening wall concrete (garage floor). there special chisel?


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