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Band saw circle cutting jig.....Redux

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Project by Rick Dennington posted 02-08-2017 06:37 AM 2796 views 12 times favorited 18 comments Add to Favorites Watch

This is my version of a circle cutting jig…I wanted a jig that was dead-on accurate, easy to build, and didn’t use a lot of parts to make….This is what I came up with after a couple of prototypes, or trial and errors…..
On the back side I measured over to the center of the ply vertically, and mounted the T-track with 4 screws..no glue..The T-track fit perfectly in the miter slot on the bandsaw.. Then I found the center line on the face side, and measured it horizontally, which was 7 1/2”....Drew a line all the way across….Put the T-track in the miter slot, and cut a groove all the way to the center line, stopping the teeth of the blade dead on the line….From the blade I measured over 1”, and measured the rest of the holes in 1” incriments….Took an awl and punched a small hole where each of the holes would go, being careful to stay dead on the line….Then I used a 1/4” Forstner bit and drilled all the holes 1/4” deep, and numbered each hole…After that, I put the jig back on the saw, pushed it to the center line, then added and glued a stop block underneath the front of the jig…..I then cut a 1/4” dowel a 1/2” long to act as a pivot point for the center of the circle I would make, drilling a 1/4” hole in the circle…..After everything was done and tested, I then put iron-on edging on the raw ply edges just to dress it up a bit…..Put on two coats of tung oil top and bottom, and let it dry good….That’s it….!! I wanted this jig to be dead-on accurate, and it is….!! Thanks for looking…

Materials:
(1) 1- piece of 3/4” Birch plywood 15” x 21”
(2) 1- 3/8×3/4” T-track
(3) 1- 3/4×3/4” Walnut stop block
(4) 1- 1/4” x 1/2” dowel

-- Here in the South, we say "down the road a piece"...and , "it's over yonder".....!!





18 comments so far

View bigblockyeti's profile

bigblockyeti

4121 posts in 1323 days


#1 posted 02-08-2017 02:01 PM

Simple, efficient, accurate & doesn’t take up too much room or cost much to make. I know what my next shop project is. Great work!

View Rick  Dennington's profile

Rick Dennington

5392 posts in 2797 days


#2 posted 02-08-2017 02:27 PM

Thanks, bigblockyeti…..Yep….it’s easy to make, and works quite well…I’m pleased with the results. I appreciate the nice comment.

-- Here in the South, we say "down the road a piece"...and , "it's over yonder".....!!

View ScottM's profile

ScottM

450 posts in 1749 days


#3 posted 02-08-2017 02:49 PM

Looks good. One question, though; maybe two. Do you clamp the jig somehow to the band saw table? If not, what keeps it from, potentially, creeping backwards as you rotate your blank; just pressure in rotating?

View Rick  Dennington's profile

Rick Dennington

5392 posts in 2797 days


#4 posted 02-08-2017 03:05 PM

Thanks Scott, for the nice comment….No, I’ve never clamped it to the table, but I suppose you could if you wanted to, as long as the clamp doesn’t interfere with the circle you’re cutting. I’ve never had it to creep backwards, either, but I think you’re on the right track…..the downward pressure on the blank keep it from doing that…..Good question…..One note: I made several test cuts using different size circles (5,6.7.etc.), and it never tried to creep..

-- Here in the South, we say "down the road a piece"...and , "it's over yonder".....!!

View woodbutcherbynight's profile

woodbutcherbynight

2914 posts in 2012 days


#5 posted 02-08-2017 04:01 PM

Looks good, as you have said a simple but accurate jig.


Looks good. One question, though; maybe two. Do you clamp the jig somehow to the band saw table? If not, what keeps it from, potentially, creeping backwards as you rotate your blank; just pressure in rotating?

- ScottM

Several methods could be used to clamp the jig in place. All involve adding more hardware and more time in design getting away from Rick’s keep it simple idea. If you were making 7 circles all at the same time a clamp or clamps would complicate the cutting process. This design has a very low profile, maybe 1 1/2 thick with the top and the runner with stop block. Storage is much easier for such a jig verses say a cleat under the top that locks into place on the bottom of the bandsaw table. That would add another 2 – 2 1/2 inches to the profile and now we have a jig that is 4 inches thick to store somewhere, oh and it does not sit flat either. LOL.

-- Live to tell the stories, they sound better that way.

View dawsonbob's profile

dawsonbob

2186 posts in 1358 days


#6 posted 02-08-2017 05:36 PM

That’s a nice simple jig that probably should be in every shop. Good work, Rick.

-- Mistakes are what pave the road to perfection

View Rick  Dennington's profile

Rick Dennington

5392 posts in 2797 days


#7 posted 02-08-2017 05:46 PM

Thanks woodbutcher and dawsonBob,

The whole plan was just to keep it simple, yet do the job it was built to do…..I like woodbutcher’s idea of “low profile”....That’s the way I intended it….

I appreciate the nice comments, guys…..Thanks for looking….!!

-- Here in the South, we say "down the road a piece"...and , "it's over yonder".....!!

View dannmarks's profile

dannmarks

229 posts in 184 days


#8 posted 02-08-2017 05:52 PM

Pretty simple, and I will be making one soon. Thanks for sharing.

View helluvawreck's profile

helluvawreck

25273 posts in 2469 days


#9 posted 02-08-2017 06:34 PM

You have built yourself a nice practical circle cutting jig and it will be a fine addition to your shop.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View Rick  Dennington's profile

Rick Dennington

5392 posts in 2797 days


#10 posted 02-08-2017 06:44 PM

Thanks danmarks and Charles, for taking the time to look and leave a post..I appreciate it very much….

danmarks…..Feel free to make one for your shop….You are more than welcome to.

Charles…..That was my intentions to make it simple, and practical, but accurate…..It works good, and cuts perfect circles…

-- Here in the South, we say "down the road a piece"...and , "it's over yonder".....!!

View ScottM's profile

ScottM

450 posts in 1749 days


#11 posted 02-08-2017 07:48 PM


Thanks Scott, for the nice comment….No, I ve never clamped it to the table, but I suppose you could if you wanted to, as long as the clamp doesn t interfere with the circle you re cutting. I ve never had it to creep backwards, either, but I think you re on the right track…..the downward pressure on the blank keep it from doing that…..Good question…..One note: I made several test cuts using different size circles (5,6.7.etc.), and it never tried to creep..

- Rick Dennington

Thanks for the followup. That’s what I was thinking as I looked at it; a clamp would/could get in the way of rotating. The rotation action would sort of keep pressure on it against the bottom cleat. Like you said, nice and simple. I’ve yet to make a circle with my band saw but I’m going to “favorite” this for when the time comes.

View Rick  Dennington's profile

Rick Dennington

5392 posts in 2797 days


#12 posted 02-09-2017 12:10 AM

Scott,

Thanks ….I hope I answered your question about the part trying to creep, and the clamping problems you/we might run into….Feel free to use this as a suitable jig for making round things…!!!

-- Here in the South, we say "down the road a piece"...and , "it's over yonder".....!!

View Hawaiilad's profile

Hawaiilad

2997 posts in 2623 days


#13 posted 02-09-2017 12:57 AM

Nice and simple…I love it. And I have the same saw so I should make one as well. Thanks for sharing

-- Larry in Hawaii,

View patron's profile

patron

13561 posts in 2944 days


#14 posted 02-09-2017 03:45 AM

looks good rick

having made a few temps over the years
i learned that the cut into the jig
to slide it to the stop
needs to be at least 1/8” wide
as the thin kerf cut from the bandsaw blade
will fill with sawdust and get packed down with the spinning circle
making it hard to remove the jig after use

the blade becomes trapped in its own cut line

i’ve had to get a thin putty knife to clean out the blade slot
no fun in the middle of a project

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Roger's profile

Roger

20578 posts in 2407 days


#15 posted 02-18-2017 11:56 PM

This is a very essential addition to any bandsaw imo. I don’t think a shop should be without some sort of circle cutting jig

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. Kentuk55@yahoo.com

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