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Thread: Circle Cutting Jig Overkill
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24th June 2017, 06:41 PM #1
Circle Cutting Jig Overkill
I have been making some mobile pot stands for SWMBO with some left over kwila.
See link here
She is into Bonsai and contrary to the idea of small plants....she also has some large ones. I noticed 2 large circular pots in the garage that she hadn't used yet and I decided to make large circular stands for them so I made a new Circle Cutting Jig for my bandsaw to do the job. I only used stuff that was in the shed but I did go a tad overboard.
The Circle Cutting jig works perfectly and can handle any radius from 55mm - 1140mm.......NO that's not a typo...1140mm RADIUS. So if i ever need a 2.28m diameter wheel, I am sweet
CJ2.jpg CJ3.jpg CJ1.jpg CJ4.jpg CJ5.jpg
Youtube of Jig in action........Cutting in Progress
(Please excuse the hand held movie from my camera...I didn't have a tripod handy so I was filming with 1 hand & rotating the piece with the other)
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24th June 2017, 06:46 PM #2
Nice job. I've had issue using similar for cutting bowl blanks for woodturning in thicker stock. Might be a case of tracking?
Love to hear how you go with 150mm thick and say 100mm r if you have cause to cut such.
Oh YouTube link did not work for me
DaveTTC
The Turning Cowboy
Turning Wood Into Art
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24th June 2017, 07:20 PM #3
Oh YouTube link did not work for me...strange...it did for me when I clicked it ?
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24th June 2017, 07:21 PM #4GOLD MEMBER
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I saw the video, running quite sweetly. I was mighty impressed with the amount of waste you allowed for when rough docking the components. Looked like you added one bandsaw kerf extra only
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24th June 2017, 07:23 PM #5
Im on tapatalk. Tjat mighr be my problem
DaveTTC
The Turning Cowboy
Turning Wood Into Art
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24th June 2017, 07:33 PM #6
I think that's the reason Dave....I've tried clicking links on emails I received on my Ipad and unlike my home computer they just don't open.
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24th June 2017, 07:42 PM #7
Kuffy, thanks for that, I was really pleased with the accuracy as well.
It all comes down to
a) Making sure the blanks are square and sides all the same size
b) Placing the pivot hole exactly in the diagonal centre. I screw a temporary scrap piece of timber on the bottom and drill the pivot hole just a smidgen larger than the pin size. This helps with fitting the blank onto the radius pin.
c) Accurate measurement of the required radius from the side of the cutting blade to centre of pivot pin
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24th June 2017, 08:02 PM #8GOLD MEMBER
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Hi Dave,
I found that if the blade is forward or back from the cutting edge it doesn't track properly. Cutting undersize is from memory too far back and oversize too far forward. I have an adjustable bolt that goes on the front that allows me to micro adjust so that the cut is on the line.
Can supply a pic if required.
Hope this helps,
KrynTo grow old is mandatory, growing up is optional.
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24th June 2017, 08:03 PM #9
Pics are always good. I have pondered making it adjustable front to back as well
DaveTTC
The Turning Cowboy
Turning Wood Into Art
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24th June 2017, 08:12 PM #10
I have a circle template guide for my router, it can do radius up to 0.5 but creates a lot of dust so the bandsaw is easy to use and reduces the dust through the DC unit. It also means I can cut much thicker pieces.
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24th June 2017, 09:09 PM #11Nice job. I've had issue using similar for cutting bowl blanks for woodturning in thicker stock. Might be a case of tracking?I found that if the blade is forward or back from the cutting edge it doesn't track properly. Cutting undersize is from memory too far back and oversize too far forward. I have an adjustable bolt that goes on the front that allows me to micro adjust so that the cut is on the line.
Start the bandsaw and move the jig into the blade again , the jig has a guide strip that fits into the table guide groove...when the jig hits the stop block, I know that the front of the cutting blade is exactly in the correct alignment so I don't get under or over cutting.
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24th June 2017, 09:18 PM #12
Thanks skot. I'll try that next time I'm cutting bowl blanks
DaveTTC
The Turning Cowboy
Turning Wood Into Art
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25th June 2017, 12:53 PM #13
Finished circular mobile stands
CJ6.jpg
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25th June 2017, 08:00 PM #14GOLD MEMBER
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This is the top view of my Circle cutting jig, can go to about 650 diameter, by reversing the centreing strip. It has a dovetail on both sides, just to be different.
DSCF0401.jpg
The adjustable stop, so that the blade can be set in the correct position.
DSCF0402.jpg
Underside view of the adjustable stop, it touches just below the top of the table on the fence guide.
DSCF0403.jpg
Underside view of the fine adjustment for the centre strip.
DSCF0404.jpg
Top view of the centre strip with a view of the 7 X 6 mm threaded inserts.
I used a threaded insert, 6 mm for the centre pin, as it will allow me to put different sized pins in place, as required.
DSCF0405.jpg
Hope this helps with those that want to make an adjustable circle cutter.
KrynTo grow old is mandatory, growing up is optional.
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25th June 2017, 08:06 PM #15
Thx Kryn. Gonna have to stop by your workshop one of these days
DaveTTC
The Turning Cowboy
Turning Wood Into Art
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