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Adjustable Circle cutting Jig (for the bandsaw)

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Project by BritBoxmaker posted 1286 days ago 3521 views 16 times favorited 22 comments Add to Favorites Watch

I have decided to start experimenting with curves (how hard can it be?). So it occurred to me, as a starting point, that I needed a means of cutting circles. Adjustable too. So here it is. Well version 1.0 anyway.
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Overall size is about 380mm (18”) x 650mm (26”) by 22mm (7/8”) excluding the locating peg and guide underneath. Materials were just what I had on hand; 11mm chipboard, some lengths of Sapele, an M6 (1/4”) machine screw, washer and wing nut, one 6mm (1/4”) dowel and some 20mm (3/4”) screws.
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It will cut circles from 50mm (2”) radius to 1000mm (3’ 3 3/8”). For the larger half of the range you slide the adjustable stock out and insert it reversed.
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Pics are
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1. The jig in place, clamped down.
2. As seen from the operating position.
3. The underside of the jig showing the runner (Sapele) which locates it in the bandsaw table.
4. My bandsaw ELU 3401.
5. Aligning the locating peg (centre of peg to front edge of bandsaw blade).
6. A 55mm MDF circle made with the jig and the 3mm (1/8”) strip I later sawed off of it).
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As I said this is version 1.0. There are improvements I’d make to it. If anyone is interested I’ll blog the construction when I make version 1.1

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





22 comments so far

View hairy's profile

hairy

1988 posts in 2138 days


#1 posted 1286 days ago

Nice jig there, Martyn! I’m sure this will make for some interesting candy.

-- the last of Barret's Privateers...

View BritBoxmaker's profile

BritBoxmaker

4340 posts in 1642 days


#2 posted 1286 days ago

Yes, hairy. Several ideas on the boil as we speak.

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

View Alongiron's profile

Alongiron

401 posts in 1299 days


#3 posted 1286 days ago

I like the design. I suggestion maybe for version 1.1; maybe cut a slot along the entire width of the jig so that you can loosed up the pin and slide it to the correct radius that you need for your project. By doing this you would not have to keep drilling new holes each time.

-- Measure twice and cut once.....

View SPalm's profile

SPalm

4761 posts in 2487 days


#4 posted 1286 days ago

Nice jig. I need to spend more time on making mine. Good for you.

This will be a cool tool. It looks like the upper left hand corner of pic6 shows some repeatability. Sweet.

Steve

-- -- I'm no rocket surgeon

View shipwright's profile

shipwright

4849 posts in 1403 days


#5 posted 1286 days ago

It’s going to be fun to watch your mind work with this new tool. I can’t wait.

P.S. I’ve always worked with curves and angles. It’s the straight lines I have to experiment with.

Thanks Martyn.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View BritBoxmaker's profile

BritBoxmaker

4340 posts in 1642 days


#6 posted 1286 days ago

Yes, Steve, definite repeatability.
.

Plus a bit of masking tape!

It occurs to me that this jig would work equally well on a scroll saw. I may have to investigate that.

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

View Diggerjacks's profile

Diggerjacks

1738 posts in 1744 days


#7 posted 1286 days ago

Hello Martyn

A very nice and usefull jig

Another jig I must do in the future

Thanks for sharing

-- Diggerjack-France ---The only limit is the limit of the mind and the mind has no limit

View jim C's profile

jim C

1452 posts in 1704 days


#8 posted 1286 days ago

I absolutely love the Brits and their terminology

“Ideas on the boil”

Great phrase.

Oh and…..Nice fixture. Have fun with it.

-- When I was a boy, I was told "anyone can be President", now I'm beginning to believe it!

View mafe's profile

mafe

9456 posts in 1695 days


#9 posted 1286 days ago

Rally nice!
One of those jigs I also want to make a multipurpose version of, that can be used on the bandsaw, discsander and scroll saw, perhaps even the circular saw…
Best thoughts,
Mads

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View Sodabowski's profile

Sodabowski

2002 posts in 1438 days


#10 posted 1286 days ago

Smells like Norm’s v2 :)

-- Holy scrap Barkman!

View Thos. Angle's profile

Thos. Angle

4435 posts in 2568 days


#11 posted 1286 days ago

Seems I have one of these in my projects. It really works well. Great build

-- Thos. Angle, Jordan Valley, Oregon

View Yekrub's profile

Yekrub

47 posts in 1606 days


#12 posted 1285 days ago

I just received a bandsaw in the mail this past week and was sitting in my shop last nite wondering how I could cut out circles cleanly and easily. This jig would work great but I do have a question.

It looks like your workpiece is elevated above the table. By elevating the workpiece, would this not cause tear-out or possibly roll the piece over when working on smaller circles?

Thanks for the idea!

View BritBoxmaker's profile

BritBoxmaker

4340 posts in 1642 days


#13 posted 1285 days ago

Nope the workpiece is flat with the top of the jig, which is securely mounted on the bandsaw table.

Thomas, I haven’t seen Norm’s v2. I started from scratch. But if two people come up with the same design its obviously an idea that works and not an unusual occurrence. :)

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

View tdv's profile

tdv

1114 posts in 1676 days


#14 posted 1285 days ago

I think Yekrubs referring to the unsupported overhang between the top table of the jig & the blade Martyn
but it’s easily solveable

-- God created wood that we may create. Trevor East Yorkshire UK

View BritBoxmaker's profile

BritBoxmaker

4340 posts in 1642 days


#15 posted 1285 days ago

Yes, Trevor, good point. You just put a stand under it. Seemed obvious to me but then I’ve been at this sort of thing a long time.

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

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