Gantry Circle jig

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Project by Bill Huffman posted 07-15-2014 01:50 AM 4270 views 39 times favorited 21 comments Add to Favorites Watch

This is what I came up with for cutting and/or truing circles.

I never built a circle jig for my bandsaw, it just seemed too wonky to support the work piece, and the router base type always made it difficult to secure the workpiece to the table without having to reposition clamps.

My Circle Jig attaches at both ends with qwik-clamps to the extension table and the fence. I can then use my rout-r-lift for cutting. Multiple passes are fine as the piece just stays where it is and I adjust the height of my router.

It cuts very, very smoothly, and because its supported on both sides, is very stable.

I can use a centering piece double taped on the workpiece as in the photo, or I just drill an 1/8” hole in the wood. Due to the ability to tighten down the center pivot pin, the piece is very secure.

The pivot pin is a ground and polished bolt. On the bottom of the pivot pin holder is a “T” nut and on top a locking nut and washer. These work together to both adjust the height and the position of the pivot pin.

-- Im so impressed with what people can do, and I wonder how they do it. Thats what keeps me doing it.

21 comments so far

View waho6o9's profile


6391 posts in 1664 days

#1 posted 07-15-2014 02:15 AM

Very nice and innovative, thanks for sharing.

View DIYaholic's profile


18006 posts in 1762 days

#2 posted 07-15-2014 02:31 AM

An original solution….
To an age old problem.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

View ralbuck's profile


1084 posts in 1353 days

#3 posted 07-15-2014 03:53 AM

Hell of a good idea!

I may have to copy the idea!

Thanks for showing us!

-- just rjR

View AnonymousRequest's profile


861 posts in 636 days

#4 posted 07-15-2014 04:19 AM

Pretty slick!

View Dutchy's profile


1264 posts in 1256 days

#5 posted 07-15-2014 09:39 AM


-- My englisch is bad but how is your dutch?

View Tootles's profile


719 posts in 1589 days

#6 posted 07-15-2014 09:46 AM

I really like this idea. It has me thinking about whether I could adapt it so that the centre pivot is fixed and the two oustide feet slide in and out. That would allow me to use it on a variety of machines. Since I am a teacher and have moved schools a couple of times in the last few years, that could be an advantage.

-- I may have lost my marbles, but I still have my love of woodworking

View SPalm's profile


5185 posts in 2969 days

#7 posted 07-15-2014 11:38 AM

I like this a lot. It would fit my shop like a tee.
Thanks for the pointer.

You have some really cool ideas up in that noggin of yours.


-- -- I'm no rocket surgeon

View ChrisK's profile


1415 posts in 2169 days

#8 posted 07-15-2014 11:52 AM

Clever, I will probably do something similar for my router table.

-- Chris K

View hotncold's profile


760 posts in 632 days

#9 posted 07-15-2014 12:13 PM

Now that is nice! Great solution.

-- Dennie - Tennessee

View michelletwo's profile


2463 posts in 2103 days

#10 posted 07-15-2014 12:41 PM


View woodsmithshop's profile


1232 posts in 2633 days

#11 posted 07-15-2014 02:36 PM

is the foot a friction fit only, or is there a hole drilled in the project to pivot on?

-- Smitty!!!

View BritBoxmaker's profile


4586 posts in 2123 days

#12 posted 07-15-2014 02:56 PM


-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging.

View Bill Huffman's profile

Bill Huffman

154 posts in 506 days

#13 posted 07-15-2014 03:07 PM

Thanks for the comments everyone.

for Woodsmithshop; The picture shows me using a small drilled wooden washer of sorts which I double side taped to the workpiece so its fixed pretty well. This was a shelf for my nephew, (a Deathstar shelf) and so I could have drilled a small hole to use as the pivot point. I have used both techniques and they work equally well.

-- Im so impressed with what people can do, and I wonder how they do it. Thats what keeps me doing it.

View English's profile


374 posts in 564 days

#14 posted 07-15-2014 06:22 PM

Very good Idea!! Thanks for sharing with the rest of us.

-- John, Suffolk Virgina

View iminmyshop's profile


231 posts in 1081 days

#15 posted 07-15-2014 09:25 PM

Thank you thank you thank you.

showing 1 through 15 of 21 comments

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