|Project by Jim Rowe||posted 03-06-2012 03:00 PM||2723 views||2 times favorited||4 comments|
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
-- It always looks better when it's finished!