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Reproduction circle cutting jig

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Project by Jim Rowe posted 876 days ago 2033 views 2 times favorited 4 comments Add to Favorites Watch

Having seen many of the great examples of Circle cutting jigs for bandsaws here on LJs I decided that instead of creating yet another one I would try and make a reproduction incorporating features from previous members but with a couple of “new” features that I think will be useful. I have made my version from scraps I found hidden away in my garage and the only specifically purchased item is a nylon knurled nut – the purpose of which I will explain. The platform is 19mm MDF, the dovetail sliding tray is oak from a previous project and sliced ash was used to clad the whole construction. The dimensions fit the work table on my Hammer bandsaw.
Picture 1 shows the basic platform with sliding dovetail tray.
Picture 2 shows the sacrificial insert for the 6mm blade and one of the four rare earth magnets that hold a steel rule in place to ensure accurate radius setting. The pivot pin is a 6mm screw held in a threaded insert – this will allow alternate pivots to be used as necessary. I need to find a way of adding centred sharp point to a screw without the use of a lathe. Filing seems to be the only way?
Picture 3 shows the nylon nut that locks the sliding tray in place once the desired radius has been selected. Fixing from the side like this is less fiddly that the underfloor method sometimes used.
Picture 4 shows the first test cut – a 50 mm diameter piece of yew.

The jig can make circles up to 60 cm in diameter.

I plan to make a drum sander in the next few months and will use this jig to make the roller. It will also be used for other box type projects over time.

Thanks for looking
Jim

-- It always looks better when it's finished!





4 comments so far

View jockmike2's profile

jockmike2

10635 posts in 2850 days


#1 posted 875 days ago

Great upgrade using your and others ideas. Looks like you had your idea pretty well ahead of time. I like to make jigs and see others.

-- (You just have to please the man in the Mirror) Mike from Michigan -

View Jim Rowe's profile

Jim Rowe

540 posts in 916 days


#2 posted 874 days ago

Thanks. Pictures are not great but the main thing is that the jig works, allows a high level of accurate repeatability and above all was cheap to make.
Jim

-- It always looks better when it's finished!

View BigTiny's profile

BigTiny

1664 posts in 1492 days


#3 posted 873 days ago

Hi Jim.

Easy way to put a point on a bolt is to chuck it in your drill press. Of course, you gotta cut off ther head first, but for many uses that ain’t a problem…

Paul

-- The nicer the nice, the higher the price!

View Jim Rowe's profile

Jim Rowe

540 posts in 916 days


#4 posted 873 days ago

Thanks Paul. I’ll try that in the morning. I will need to cut a slot in the remains of the threaded portion so that I can screw it into the threaded insert.
Jim

-- It always looks better when it's finished!

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