|Project by HankLP||posted 03-01-2017 08:17 PM||1874 views||15 times favorited||7 comments|
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.