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Adjustable Circle Cutting Jig version 2.0

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Project by BritBoxmaker posted 1302 days ago 5334 views 34 times favorited 32 comments Add to Favorites Watch

This is version 2.0 of my Circle Cutting Jig for the band saw. Its a lot more rugged and accurate, including, as it does, a micro-adjust feature.

The overall size is 750mm x 400mm x 30mm. Materials are chipboard (laminated in three layers) and Beech with a length of M8 threaded rod, various metal and plastic bits. Circle cutting range is from 25mm radius to about 450mm radius. (I’m sure you can do the conversion into inches by now, there are 25.4mm to 1 inch)

This time the pin (with adjustable distance from the blade) is an M6 roofing screw. This is mounted in a sliding section of the table (bottom right of pic. 2) set in an M6 ‘T’ nut. This is detailed in the upper portion of pic. 5.
The sliding table section is held down due to its 15° bevelled sides.

The bottom portion of pic 5. shows the threaded rod which goes the entire length of the jig (This rod is imbedded in a slot between the middle and upper sheet of the chipboard). It threads into an M8 ‘T’ nut set into the left hand side of the sliding part of the table (pic. 6) and is captive at the extreme left hand edge of the jig, where the adjustment wheel is. The scale on the adjustment wheel is from a project by Russ (rmac) and is the only idea in this project that I’ve sourced from elsewhere. Thanks Russ. The adjustment wheel and its guide line are shown in pic. 4.

The M8 thread pitch is 1.25mm. There are 25 graduations around the adjustment wheel making the pin position accurate to 0.05mm. I know band saw blade run-out is greater than this but I will be using this jig for multiple, evenly spaced cuts, from the same workpiece and it is the cut spacing accuracy I am concerned with.

The jig is located into the bed of the bandsaw by a guide rail and clamped in position to the bed when in use.

I realise that all of the above may not be easily seen or grasped and so I may be blogging the build of this jig in the near future if there are many questions.

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





32 comments so far

View Andy's profile

Andy

1535 posts in 2542 days


#1 posted 1302 days ago

This is great! Thanks for sharing with all of us.
Andy

-- If I can do it, so can you. www.artboxesbyandy.com

View BritBoxmaker's profile

BritBoxmaker

4358 posts in 1670 days


#2 posted 1302 days ago

Thanks, Andy.

Well at least someone was able to understand my ramblings, above!

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

View TheDane's profile

TheDane

3742 posts in 2297 days


#3 posted 1302 days ago

Martyn—I like the threaded rod for fine adjustment … the one I made just has the center pin set in a sliding track that is secured (from the underside) with a plastic knob, which pretty much eliminates any micro-adjustment capability.

Thanks for posting this!

—Gerry

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View j_olsen's profile

j_olsen

155 posts in 1805 days


#4 posted 1302 days ago

i can see the use of andy’s clamp mechanism in this jig for quick positioning
very very nice build Martyn
thank you for posting and i for one will be looking forward to the blog

edit: gotta be ‘old timers settin in—i meant Steve’s (SPalm) clamp mechanism—sorry Andy and Steve—gets tough distinguishing all the masters!!

-- Jeff - Bell Buckle, TN

View steliart's profile

steliart

1807 posts in 1322 days


#5 posted 1302 days ago

Martyn
very well made and very nice fine adjustment system.
Thank you

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of inventions - http://www.steliart.com --

View tyka's profile

tyka

141 posts in 1327 days


#6 posted 1302 days ago

Very smart design and very well done jig. It’s in my favorites for later. Thanks for sharing.

-- Paul, Plantagenet, Ontario

View SPalm's profile

SPalm

4791 posts in 2516 days


#7 posted 1302 days ago

Seems straight forward enough to me. Nice. You always build such nice looking jigs.

Now, what you going to do with it?
Steve

-- -- I'm no rocket surgeon

View Dez's profile

Dez

1113 posts in 2711 days


#8 posted 1302 days ago

Fancy!

-- Folly ever comes cloaked in opportunity!

View SASmith               's profile

SASmith

1576 posts in 1621 days


#9 posted 1302 days ago

Great jig. I may have to try this on my scrollsaw.
I would like to see the blog if you get one put together.
Thanks for the post.

-- Scott Smith, Southern Illinois

View BritBoxmaker's profile

BritBoxmaker

4358 posts in 1670 days


#10 posted 1302 days ago

Jeff. For coarse adjustment I just clamp the piece of rod, on the left hand side, in a power drill and squeeze the trigger. Within a minute I can go from one end of the scale to the other.

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

View davidroberts's profile

davidroberts

1002 posts in 2120 days


#11 posted 1302 days ago

Brit – very smart. Send that to Wood magazine or similar woodworking mag and get a free tool or two. Really. No, really.

-- God is great, wood is good. Let us thank Him for wood......and old hand tools.

View BritBoxmaker's profile

BritBoxmaker

4358 posts in 1670 days


#12 posted 1302 days ago

Oh thanks, David. Never thought of that.

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

View Diggerjacks's profile

Diggerjacks

1745 posts in 1773 days


#13 posted 1302 days ago

Hello Martyn

Another very good jig

Do you have another version for the future ? A beautiful work I like the micro-ajust

Have you done some project with this jig?

Thanks a lot for sharing.

This jig give me some ideas

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

View BritBoxmaker's profile

BritBoxmaker

4358 posts in 1670 days


#14 posted 1302 days ago

Keep an eye out, Diggerjacks. When I recover from making the jig I’ve an idea or two I want to try with it.

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

View Diggerjacks's profile

Diggerjacks

1745 posts in 1773 days


#15 posted 1302 days ago

I’m sure you have done this jig for one or two projects and you have another for the future

We can’t make a jig just for the pleasure !!!!!
We make a jig for a project and we have a lot of pleasure to make it

My eyes are open

Have a nice day

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

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