- 4-1/2" 10amp Angle Grinder with a 4-1/2" Diamond Blade
- 3lb. hammer
- Masonry Chisel
- A rock. In this case SF Cobblestone
First I made a bunch of parallel cuts in the rock with the angle grinder near the center. Put the chisel in one of the grooves and smash out the waste with the hammer. You should start to create a depression in the center of the rock. Keep making parallel cuts and smashing out the waste. Alternate the direction of the cuts after you knock out each layer of waste. For example cut left to right then knock out the waste thereby eliminating those lines then make cuts from top to bottom, knock out the waste and so on. Keep the cutting area well away from your edges because the angle grinder can kick out and damage the top. Once you've gotten the hole deep enough scratch out the edges on the top of the rock and cut them. Hopefully the hole and rock are large enough to fit the blade deep enough to keep cutting. Otherwise you need a larger hole or a smaller blade or a larger rock. I know that there are 4" diamond and composite blades also there is a small Dremel diamond blade that I've not tried (it costs as much as a 4-1/2 blade ~$15). Pictures to come
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