I wanted to really get a perfect match between my inner walls, the plywood frame and larger outer wall. I came up with an idea for a rotating arm that can hold a pencil and then the pencil holder attachment to draw the curve which can be swapped out with another attachment the bolts to a router. I can cut about 1/16” outside the drawn line and then use the router to cut a perfectly round edge that will also be perfectly perpendicular to the wall. Anybody try this kinda thing before? I have to wait for the glue to dry before I attempt to use it. After a light sanding and a coat of George’s Clubhouse Wax or paraffin it’ll be ready for action. I used the flush trim bearing from a dull router bit to keep the hole from getting loose and less accurate. It pressed in nice and tight into the 3/8” drill hole.
I did google this and the do make these but not for the range of radii I am working with and they don’t come with pencil holders. Pretty simple to make.
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