It takes a lot of effort. The first step is to put the diamond grinding wheel on the grinding machine to polish the stone.

Then use an electric hammer to make many holes in the stone, so that it won't penetrate.

Use a hammer and a steel drill to break the stone with a hole and gradually expand it to the edge. Pay attention.

Finally, use a diamond grinding wheel to grind the edge that the steel can't cut, and water it while grinding.

Well, it depends on your skill.

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