When making the jig for routing the hole, decide the diameter of the bit that you will use, also the outside diameter of your chosen template guide then use this simple formula: guide dia. - bit dia. + size of the finished hole. For example, a 1/2" bit and a 1.5" guide + 2 1/2" finished hole: 1.5 - 1/2" + 2.5 = 3.5".
The simple corner jig shown takes just minutes to make and you decide on the radius. I saw the corners off first. The shot was of a quick set-up for a member several years ago.
The pdf shows how to make a very simple circle routing jig.
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Last edited by harrysin; 12-26-2017 at 09:35 AM.