How do people cut sharp inside corners, like the triangles shown? This example is cut in stone but I have seen similar features on wooden building blocks.
this post was submitted on 29 Oct 2023
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Can you wire-EDM natural rock? If this were a through-hole instead of indentation, I'd say using an old fashion file or a (mechanical) planer.
Sorry, I am stuck in the metals space and took this as a general question. For the specific situation above, it's likely a chisel or some kind of masked abrasive blast