On my bench this weekend you may have seen a nice sized circle as part of the project. Here is is being cut on the bandsaw. The only major drawback to trying to do this on the bandsaw is how do you start the cut since you are starting with a square blank bigger than the radius? This jig opens and closes and is attached to my side extension table. For small circles (lathe stuff) I can just start my sled back and push the whole jig into the cut, but once I gett bigger than about a 12" radius this proves impractical. Here is a 48" circle almost complete and below the picture is a link to the jig itself and basically how it works. Sure is alot faster than using a router and every bit as true.