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Am I missing something? The holes can't be square, because of the rotating motion required to create them they will always have rounded corners. I'd like to se

• iguanatom 17y ago
  You are right, it's not really square, but the rounded edges can be chiseled away fairly easy, especially if the drill bit has the chisel built right into it as jacquesm's earlier image showed (http://www.machinemart.co.uk/images/library/range/large/0104.jpg http://www.machinemart.co.uk/images/library/range/large/0104...). although if it's hard wood, you may need to use a solid chisel and a hammer to pound the heck out if it.
• ianferrel 17y ago
  That's what I thought, too, but then I realized that what we were both missing is that the edges of the cutting surface are not the same as the edges of the shape. The vertices really do trace out a right angled square, so if you just put cutting surfaces at the vertices and inside them, it really will cut a square.