Simple jig allows you to cut perfect circles with a band saw
In the Great Book of Woodworking, the Editors of Skills Institue Press demonstrated how to make a Shaker-style Candle Table. The project required you to cut a perfect circle.
While there are commercial jigs to cut perfect circles with a router or a band saw, attached are plans for a shop-made jig to use on a band saw.
With a little planning you could make one for the scroll saw as well.