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Unread 05/11/2010, 10:35 AM   #8
Lanimret
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Join Date: Apr 2010
Posts: 64
You can do it with a straightedge, but I prefer to do it with an outside form and a bottom bearing bit (or a router collet).

Just take 4 strips of 1/2 particle board (or whatever you have lying around) and build a full guide. This way you can guarantee square and have almost no chance of making a mistake (as long as you clamp it down tight). Just make sure the frame is square and flat on both sides. A 1/8" bit is fine, just go slowly or you'll risk snapping it off.


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