router circle jig

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Forum topic by buckbuster31 posted 12-27-2016 06:39 PM 676 views 0 times favorited 6 replies Add to Favorites Watch
View buckbuster31's profile


254 posts in 663 days

12-27-2016 06:39 PM

New to the forum, but been long time lurker and woodworker. What router bit would you all recommend for a circle jig for router? I was commissioned to make a lazy susan and these seems to be the easiest route for me due to my band saw not quite being large enough.

6 replies so far

View brtech's profile


1042 posts in 3070 days

#1 posted 12-27-2016 07:08 PM

Spiral. You can do it with a straight bit, but a spiral is best. Whether you want upcut or downcut depends on how you are attaching the wood to the jig.

Use a bandsaw or even a jig saw to get close to, but not on the line. Then trim away.

I’ve seen people build a circle cutting jig for a bandsaw that put the center off the edge of the saw table. That let them cut an arbitrary sized circle with their bandsaw. Of course, you have to support the jig on something that keeps it level with the table, but I’ve seen something that wasn’t really much more than a stable floor stand with a pivot point on it and a brace that clamped to the base of the bandsaw to keep in in the right position.

View Fred Hargis's profile

Fred Hargis

5095 posts in 2641 days

#2 posted 12-27-2016 07:11 PM

Most any straight bit will do. If you cut the work piece down close to the final size, a 2 flute bit will do nicely. If you don’t trim the work piece, you might need a bit that will “plunge” cut. I’m a little puzzled by the comment about your bandsaw…I’ve cut some fairly large circles on a not-so-large bandsaw using a circle jig.

-- Our village hasn't lost it's idiot, he was elected to congress.

View jerryminer's profile


944 posts in 1589 days

#3 posted 12-27-2016 07:15 PM

Any straight bit will work, but as mentioned, a spiral bit will cut cleaner.

I like to take an off-cut to make a sanding block of the right radius. Fill in the waste area with a piece of cork of appropriate thickness. No flat spots created by sanding that way.

-- Jerry, making sawdust professionally since 1976

View OSB's profile


147 posts in 673 days

#4 posted 12-27-2016 07:51 PM

I am going to steal that sanding idea.

View jmartel's profile


8155 posts in 2297 days

#5 posted 12-27-2016 08:27 PM

Go with a 1/2” spiral bit. Either up or down cut works. Just make sure to orient the face side away from the direction of spiral. If you have an up spiral bit, put the show side down. If you have a down spiral bit, put the show side up.

If you want to cut a circle but not leave a mark in the center from the center pin, use a scrap of wood/plywood and secure it with double stick tape. Put another scrap of the same thickness under the router base, leaving the bit exposed below it. Then pivot it around the scrap in the center.

-- The quality of one's woodworking is directly related to the amount of flannel worn.

View JAAune's profile


1838 posts in 2464 days

#6 posted 12-27-2016 11:35 PM

Be careful with the downcutters in a handheld router. They want to climb up and out of the cut. Upcut bits pull the router against the workpiece.

-- See my work at and

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