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If you need to make a bunch of the same size, you could make a template out if thin 1/4" material- using any of the jigs listed above (mine is a simple piece of scrap 1/2" thick plywood 6"x24" with a carriage bolt in one end and the router mounted to the other- The carriage bolt goes through the middle of the circle and I adjust the diameter by moving the carriage bolt closer or father away from the router).
once you have your template, rough cut all your circles with band/jig saw keeping 1/16 to 1/8 wide of the desired circle, mount the template to it with double sided tape (you need less than you think- very sticky stuff) and use a flush trim bearing guided bit and you'll have identical, perfect circles every time without having to drill a hole in the middle.
It's a bit of a process, but if you need a bunch, once the template is set it's smooth sailing... plus it's nice not putting a hole in the middle...
once you have your template, rough cut all your circles with band/jig saw keeping 1/16 to 1/8 wide of the desired circle, mount the template to it with double sided tape (you need less than you think- very sticky stuff) and use a flush trim bearing guided bit and you'll have identical, perfect circles every time without having to drill a hole in the middle.
It's a bit of a process, but if you need a bunch, once the template is set it's smooth sailing... plus it's nice not putting a hole in the middle...
