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I Forge Iron

Drilling a square hole

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Broaching is surely one approach, although, the equipment is expensive and specialized, another way would be to hot punch, not easy on a large piece. Now days EDM (electro discharge machining) would be the preferred approach for a high tolerance hole. That is the way I made my bolster plate and a small swage block, since my brother is a tool and die maker and the EDM was not in use. ;) I just thought that the drilling a square hole was a great example of

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