adjustable circle jig for router

I’m making a steam box, or snake coffin as Curtis Buchanan calls it. I needed to cut circles in ply to make an adjustable jig for my little dewalt router. Got the idea from a u-tube video. Used 1/4-20 nuts for t-track and steel with 1/8” brass rod for a pivot pin. Left over 3/4” ply salvaged from cabinets I ripped out of the garage after we bought the house. I’m not in to using baltic birch ply for jigs, especially when I don’t expect to use them very often. You can see I routed the groove off center and had to glue in a filler strip. Oh well. It won’’t win any beauty contest for sure. But it works. Good for 1.5" to 34".

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It sure looks like it will get the job done! I use 1/4 inch Lexan and a 1/16 drill bit for the center (I had Lexan scraps on hand) The Lexan has the advantage of allowing you to see what you are doing. Your adjusting feature is excellent. I need to incorporate something like that. I rely on a series of holes, which can be confusing. Good luck with the snake coffin! That will be a satisfying project!

Paul -

Forgive me for being a little thick - I can't figure out what you've got there in relation to your written description. Could you add a little more info plus a few more pics (especially of the upper surface of the plywood)

I'd really appreciate your help.

Howard

Howard,

More photos. Hopefully they show what you are looking for.
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It would be better if you watch the youtube video that I got the idea from. I did not make the rotating router base shown in the first part of the video. Starting about 13 minutes 40 seconds shows where I got the idea. https://www.youtube.com/watch?v=uPnE...index=4&t=938s