LumberJocks

Circle Cutting Jig for Bandsaw

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Project by HankLP posted 03-01-2017 08:17 PM 2089 views 15 times favorited 7 comments Add to Favorites Watch

There are a lot of circle cutting jigs on the web, and this one combines the features I like best. It is simplified in construction and doesn’t need hardly any set up when you want to pull it off the shelf and start cutting a circle. The radius is infinitely adjustable, and when you are ready to cut a circle it slides into place and self-aligns with the bandsaw blade. I just used this jig to cut some ~20” diameter pieces for the Thein Baffle shown in my next project.

Some descriptions are included below for those who are interested, or new to this type of jig:

- Picture 2 is the bottom of the table showing the miter bar, and the stop bar at the front of the table. The miter bar is 1/2” plywood ripped to 3/4” width to fit this table. The bar is set in a groove cut on the router table and is simply glued down. The stop bar allows the table to slide in place without having to do any measuring or adjusting in relation to the saw blade. This stop bar is quite thin because it has to clear the fence rail on the front of the saw.
- Picture 3 and 6 show the mini t-track which easily adjusts for the radius of the circle. It has a 1/4” steel pin and a 1/4” t-bolt with a knob (a hex head bolt and wing nut work just as well). The pin was set rigidly by drilling a hole in the t-track undersized by 1/64” (i.e. 15/64” diameter). After cleaning out the hole with a rat tail file and filing a very slight taper on the pin, the pin was tapped into the hole to sit flush with the inside of the t-track. The pin has to slide past the t-bolt, so be sure not to tap it all the way through the track.

UPDATE: The 1/4” pin came loose due to the small taper from filing, so I turned it over and drove it all the way through the t-track from the “channel” side. It fits very tight now.





7 comments so far

View rubber_ducky's profile

rubber_ducky

36 posts in 574 days


#1 posted 03-01-2017 08:25 PM

nicely done. added to my favorites.

simple and effective design

View JRAP's profile

JRAP

59 posts in 1646 days


#2 posted 03-02-2017 12:52 AM

Great job. Where did you get the T-track?

-- -- Jim, Cumberland,RI -- Life is all the other stuff you do when you're not in the shop. - http://www.woodshopshed.com

View woodenwarrior's profile

woodenwarrior

218 posts in 1891 days


#3 posted 03-02-2017 03:52 AM

I’m digging the upside down T-track trick! That’s really clever!!

-- Do or do not...there is no try - Master Yoda

View HankLP's profile

HankLP

27 posts in 198 days


#4 posted 03-02-2017 07:39 AM

You can get the t-track from many online stores. Peachtree, Lee Valley, Rockler, and many others.

View DDWW's profile

DDWW

49 posts in 323 days


#5 posted 03-02-2017 04:30 PM

I used upside down T track in the router circle jig I posted. It works great and really locks down tight.

I think i’ll use it on my circle jig thanks for posting.

View 67flh's profile

67flh

63 posts in 977 days


#6 posted 03-03-2017 01:46 AM

I made one of these and they do an incredible job!

-- Brad

View Robsshop's profile

Robsshop

903 posts in 2671 days


#7 posted 04-01-2017 03:39 PM

Thanks for posting , quick, simple and effective jig . I just purchased a Grizzly 17” BS and will put together a jig much like yours to go with it. Thanks again, nice job!

-- Rob,Gaithersburg,MD,One mans trash is another mans wood shop treasure ! ;-)

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