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Reply by JJohnston

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Posted on Cutting a circle with my router?

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JJohnston

1577 posts in 1918 days


#1 posted 1534 days ago

The jig is designed to work with a 1/4” straight bit. I plunge in several small increments, and go around several times. Yes, they are holes. Here’s a better shot of the underside. You drill a 1/8” hole at the center, then stick the rod into the chosen hole in the jig and down into the work. As you can see, the holes are arranged by the whole diameter in inches along the bottom axis, with the fractional part on the vertical. The holes for each whole inch are arranged in a spiral instead of a circular arc, so each one is 1/32” farther from the bit than the last. For the smaller holes that fall inside the base plate, the pivot rod just bottoms out against the baseplate. Also shown is the slug that came out of this hole. And I guess I misspoke – it’s adjustable in 1/16” increments. The numbers shown are the diameter, so the actual distance from the pivot to the far edge of the bit is half that.

-- "Sorry I'm late. Somebody tampered with my brakes." "You should have been early, then."


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