habu68 Posted November 30, 2006 Share Posted November 30, 2006 Here are two links that explain the math of a Watts square hole end mill. http://mathworld.wolfram.com/ReuleauxTriangle.htmlhttp://upper.us.edu/faculty/smith/reuleaux.htm The math left me in the dust but I have seen this done and found it to be fun to watch. Enjoy Habu:cool: Quote Link to comment Share on other sites More sharing options...
D Ravizza Posted December 1, 2006 Share Posted December 1, 2006 Alexander Weygers shows this technique in his book The Complete Modern Blacksmith. He shows how to make the triangular drill and a hardend steel guide. It is a facinating process. I am going to have to try it one of these days. Dan Quote Link to comment Share on other sites More sharing options...
habu68 Posted December 2, 2006 Author Share Posted December 2, 2006 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 Quote Link to comment Share on other sites More sharing options...
Phil Patrick Posted December 2, 2006 Share Posted December 2, 2006 I took a look at the math,,, It made my brain itch. I'll stick to round ones Quote Link to comment Share on other sites More sharing options...
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