2||0|934|0| 0|0|0|||||You can drill a square hole|Giorgis|1|21:48:25|07/12/2008|You have an attention grabber by stating %22One can even drill square holes.%22%0D%0A%0D%0Aand later you state with emphasis %22No - you can%27t drill square holes%22 so I rectify it for you. %0D%0A%0D%0AAll you need is a drill bit%2C an almost stock standard round drill bit %21%21%0D%0A%0D%0AMake sure it has 90 degrees cone at the bottom.%0D%0A%0D%0A1. Take a piece of shim%2C fold it in half.%0D%0A2. Clamp it in a vice edge wise%0D%0A3. Drill a hole no deeper than the height of the cone%0D%0A%0D%0ATake the shim out of the vice%2C unfold ... %0D%0A%0D%0ASquare hole with sharp corners with a round drill bit no less %21%21%0D%0A%0D%0AGiorgis%0D%0Agiorgis.3erolas%40gmail.com%0D%0A%0D%0A%0D%0A%0D%0A%0D%0A%0D%0A 1|1|0|||||RE%3A You can drill a square hole|alexb||22:15:58|07/12/2008|Well%2C at least in principle you are right and I will amend the page. I%27ll have to check how practical this is%2C though. Curious.%0D%0A%0D%0AThank you. 2|1|0|||||RE%3A You can drill a square hole|Pierre Charland||08:36:12|08/18/2008|http%3A%2F%2Fmathworld.wolfram.com%2FReuleauxTriangle.html %0D%0Ahttp%3A%2F%2Fupper.us.edu%2Ffaculty%2Fsmith%2Freuleaux.htm