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Gantry Circle jig

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Project by Bill Huffman posted 07-15-2014 01:50 AM 2352 views 38 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 (online now)

waho6o9

4945 posts in 1235 days


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

Very nice and innovative, thanks for sharing.

View DIYaholic's profile (online now)

DIYaholic

13581 posts in 1333 days


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

An original solution….
To an age old problem.
BRILLIANT!!!

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

View ralbuck's profile

ralbuck

534 posts in 925 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 freddy1962's profile

freddy1962

761 posts in 207 days


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

Pretty slick!

-- JEFF Illinois (Banks of the Mississippi)

View Dutchy's profile

Dutchy

512 posts in 827 days


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

Smart.

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

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Tootles

704 posts in 1160 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

SPalm

4823 posts in 2540 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.

Steve

-- -- I'm no rocket surgeon

View ChrisK's profile

ChrisK

1158 posts in 1740 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

hotncold

476 posts in 203 days


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

Now that is nice! Great solution.

-- Dennie - Tennessee - Every Pro was once an Amateur. Every Expert was once a Beginner. So dream Big and start Now!

View michelletwo's profile

michelletwo

2258 posts in 1674 days


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

clever!

-- We call the destruction of replaceable human made items vandalism, while the destruction of irreplaceable natural resources is called development.

View woodsmithshop's profile

woodsmithshop

1153 posts in 2204 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

BritBoxmaker

4374 posts in 1695 days


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

Clever

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com

View Bill Huffman's profile

Bill Huffman

133 posts in 78 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

English

213 posts in 136 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

iminmyshop

115 posts in 652 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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