A "routah" with a circle cutting jig is what you want/need.

Home made from 1/4" plywood or store bought made out
of plastic.

A straight cutting bit and a base that can be
cut into(like mdf) and you will be in business.



Mark and Kim Smith wrote:

As part of a project I'm making, I need to make a 4' ring. The outer
circumference, which will be the 4' diameter, will be cut on my band saw
by setting up a jig that has a pivot 2' from the blade. I'm looking for
suggestions for the best way to cut the inner diameter which will be at
2' - 4" giving the "ring" a 10" width. The material is 3/4" thick. So
far I'm thinking my jig saw or my router with a fence set at 10" and
multiple passes. Any other suggestions? As always, thanks in advance!!