adjustable bandsaw circle cutting jig

[Thelt]

If accuracy is really critical my suggestion would be to cut the circle an eight inch or so larger and sand it to the "line". Or, better yet, use a router and trammel to the desired radius after cutting it oversize on the band saw. I actually would prefer the latter because 1) cutting the circle an eight inch or so larger then coming back with the router and trammel would be much less time consuming than the idea above. And, 2) way less time consuming with the router and trammel to cut the circle without the band saw. Wish you all the luck with whatever you decide.