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Simple bandsaw circle jig

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Project by RyanGi posted 08-29-2021 11:22 PM 800 views 3 times favorited 6 comments Add to Favorites Watch

I wanted to do some creative turning after seeing some interesting bowls and spindles turned with laminates running through them. After being turned, they reveal cool sweeping patterns. One such layout requires indexed curved cuts through the rough stock, with laminates glued into place before gluing the stock back together as a whole. All this means I needed a circle cutting jig for my bandsaw. After looking at a couple of commercial jigs, I decided I’d make my own.

I started with a piece of 3/4” scrap ply that overlays the BS table. My saw has a miter slot on the left of the blade, so I mounted a snug fitting runner on the edge of the ply. After cutting a zero clearance slot, the jig provides a sled-like platform for a project to rest on while being cut, and allows odd sized work to be fed into the blade on the ‘sled’ before the circle cutting action starts. A cutoff piece is anchored near the rear of the table with a clamp to provide a stop for the jig as you slide the project into the blade. Because the whole jig slides on the runner, and the stop limits that movement, it’s infinitely adjustable to insure the cutting tips of the blade are properly aligned with the sliding center pin. If the feeding action of the ‘sled’ isn’t required, a clamp on the front end of the table anchors the jig in place.

I cut a perpendicular dado and mounted a piece of T-track into it. A piece of 1/2” steel flat stock slips perfectly into the track making a sliding rail. Into that flat stock I drilled and tapped two holes, one on each end. A 5/16-18 or a 1/4-20 threaded hole transfer ‘punch’ can be threaded into one of the holes. The punches provide two different sized pins for work to be placed on and act as a pivot. The small pin produces a shallow indent for projects that don’t require as much holding strength. The larger pin sets deeper and holds more fast. For larger (taller) projects, a piece of appropriately sized thread stock can be sharpened and placed in the slide to provide a deeper pin for even better holding power during the cut (maybe for tall bowl blanks and the such?). I placed a used up adhesive-backed steel rule from another project next to the t-track to measure radius from the blade. Once the slide is in the proper position along the rule, the pin/punch can be threaded down tight against the track to hold the slide in place. This is backed up by a small threaded knob that tightens from underneath. Combined, the slide is rock solid.

I’ve only done some preliminary cuts on it, but it sets up very fast, is very adjustable, very stable and works as expected! Now I’m looking forward to making some blanks with it.

All made from scrap or tools already on hand, so that’s pretty cool. Just finished with paste wax.

-- Ryan/// I like chips...and sawdust...but mostly chips...with vinegar





6 comments so far

View therealSteveN's profile

therealSteveN

8926 posts in 1824 days


#1 posted 08-30-2021 03:06 AM

Nice job. That design works well, so easy to make, and not costly at all. You took it a step further than many do with the sliding adjustable track mounted pin.

-- Think safe, be safe

View recycle1943's profile

recycle1943

5875 posts in 2872 days


#2 posted 08-30-2021 11:19 AM

nice build, the band saw is worth more than people think

-- Dick, Malvern Ohio - my biggest fear is that when I die, my wife sells my toys for what I told her I paid for them

View BurlyBob's profile

BurlyBob

9346 posts in 3515 days


#3 posted 08-30-2021 04:03 PM

That’s a very interesting idea using t track. Nice job.

View James E McIntyre's profile

James E McIntyre

1503 posts in 2542 days


#4 posted 08-31-2021 05:53 PM

I like your idea. I may incorporate some of it into my circle jig. Mine also slides in the t-slot and has a stop block on it’s end and when the jig stops I start cutting the circle. It has a removable pin for different size circles.
You t-track is where yours excels.

What’s the smallest circle yours can make. I make small knobs for some of my projects and need the jig to be able to cut small diameters.

-- James E McIntyre

View RyanGi's profile

RyanGi

87 posts in 286 days


#5 posted 08-31-2021 09:27 PM



What’s the smallest circle yours can make. I make small knobs for some of my projects and need the jig to be able to cut small diameters.

In theory, it should be 1” dia or a little less, but that’s pretty tight with this setup. I think if I was going to do super small stuff I wouldn’t use the track. Maybe inserts with preset sizes? Like drop in blocks (in place of the track system) with a small tack as a pin to rotate about. That way it’s solid to the diameter you want. The pieces to my setup, while on the ‘fine’ side, are still pretty course to get much tighter than 1” diameter I think.

-- Ryan/// I like chips...and sawdust...but mostly chips...with vinegar

View James E McIntyre's profile

James E McIntyre

1503 posts in 2542 days


#6 posted 09-01-2021 12:05 AM

What’s the smallest circle yours can make. I make small knobs for some of my projects and need the jig to be able to cut small diameters.

In theory, it should be 1” dia or a little less, but that’s pretty tight with this setup. I think if I was going to do super small stuff I wouldn’t use the track. Maybe inserts with preset sizes? Like drop in blocks (in place of the track system) with a small tack as a pin to rotate about. That way it’s solid to the diameter you want. The pieces to my setup, while on the ‘fine’ side, are still pretty course to get much tighter than 1” diameter I think.

- RyanGi

Ryan,
That’s a small circle 1” even for me. I was thinking about your title. Simple Band Saw Circle Jig. To me it’s pretty complex. Mine is the simple jig. Lol

-- James E McIntyre

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