Router Circle Cutting Jig

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Project by ptm109 posted 11-23-2015 03:34 PM 8681 views 12 times favorited 4 comments Add to Favorites Watch

Long time watcher, first time poster. Nothing original but thought I’d get started posting on here with an easy and super helpful circle cutting jig that I needed for a dust collector project that I am almost done with. I searched for “circle cutting jigs” on Lumberjocks when I got to that point in the bigger project and found HuckD's circle cutting jig that (I believe) he came up with (while working on his dust collector coincidentally). HuckD’s done all the heavy lifting (i.e. the concept) and covers it all so well that my post here is predominantly just a compliment to his project and excellent accompanying video.

A few details:
- 3/8” drill rod for the primary rails, run through slip fit holes in the oak
- 1/4” thumbscrews with threads tapped into the wood to lock rough radius
- 1/4” threaded rod for the micro adjuster – through loose fit hole on inner oak piece and threaded T-nut on outer piece
- pivot is a screw with the head cut off and filed smooth.

For the most part I’m pretty happy with the jig as pictured and it worked great for my short term needs but I hope to revisit the pivot detail and come up with something modular for different applications. Specifically I’m thinking of something that doesn’t require drilling a center hole in your work piece – primary challenge here is that the accessory rod holes in the router base are super low leaving little room for a sacrificial center point that can be attached to the work piece with double sided tape. The first idea that came to mind would likely require a thicker base on the router but this adds complexity to the jig that HuckD’s original eliminates. If/when I come up with a solution I will try to update this project.

Thanks for looking

4 comments so far

View Bearpaw's profile


257 posts in 3957 days

#1 posted 11-23-2015 04:16 PM

A nice and sturdy jig. I like the fine adjustment feature.

-- "When we build, let us think we build forever." John Ruskin

View Rick  Dennington's profile

Rick Dennington

6348 posts in 3431 days

#2 posted 11-23-2015 11:56 PM

Stellar job on the circle cutting jig….Those jigs are so handy to have around when you need a circle…I’ve made 3, but not like the style you made….This one is more advanced than mine….I like it, plus the pinpoint adjustment.

-- " At my age, happy hour is a crap and a nap".....!!

View HokieKen's profile


7560 posts in 1375 days

#3 posted 11-24-2015 01:50 PM

Very nice work. I put HuckD’s in my favorites so I can make one someday. It really is a simple and solid design.

Welcome to the site!

-- Kenny, SW VA, Go Hokies!!!

View 489tad's profile


3496 posts in 3248 days

#4 posted 05-16-2016 11:08 PM

Very nice job. A tip I learned here is after wood is tapped coat the threads with superglue and re-tap when it drys.
Welcome to LJ’s!

-- Dan, Naperville IL, I.G.N.

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