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I made two jigs for my table top router. One uses a miter slot and the other uses a v shaped opening. I bought a spiral bit. The miter slot jig is scary but seems to work ok with a dowel hole in the middle. The V shaped jig doesn't work because as I turn the wood, it keep getting smaller and therefore is not completely round. Can I get some suggestions?
Both of those jigs look pretty scary to me. The V shaped jig will never cut a circle since the two contact points will never be an equal distance from the centre of the proposed circle. Does the mitre slot jig actually lock in the mitre slot? If not it would seem to be extremely dangerous.
IMO you'd be better off building or buying a circle cutting jig to use with a hand held router. There are many designs on the web most of which have infinite adjustability. My personal iteration can cut a circle with a diameter anywhere from 40mm (1 - 1/2") to 960mm (38").
I have used several home made and bought jigs for handheld routers.
The one in the attached is very good.
Stable to use and plenty of adjustments.
Handheld feels better for me than a router table for these jobs.
For the wheels on my carts, I used this method to ensure they were all exactly the same diameter.
The arm is stopped via a screw/bolt that winds back and forward for fine adjustment. The jig could equally be made for belt sanders, 125/150mm ROS or other sander. It doesn't need to be one of these big disk sanders.... though they are dead easy to make.
They were initially cut out with a bandsaw, but one could use a jig saw.
Aldav is right in these jigs will not give accurate repeatability. I also think jig #2 would make an excellent atmospheric launch tool. That disk will catch and spin at light speed! :) BOOSHK!
Once sanded, I put tyre grooves in the circumference with a jig the same as OPs' #1. It was safe.
Attachment 505063
I use this simple jig that has a few different diameter placements for my palm router to carve out circles. Repeat tasks have been reliable with consistent results (used it again over the weekend).
Took me about 20mins to make the jig with the different settings.
Attachment 528847 Attachment 528848