Reply by JJohnston

  • Advertise with us

Posted on Cutting a circle with my router?

View JJohnston's profile


1622 posts in 3286 days

#1 posted 06-11-2010 02:27 AM

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.

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics