CIrcle Jig/Compass
thingiverse
I wanted a way to mark out circles on plywood, cardboard, and other materials but wasn't happy with standard compasses that were limited in size. This compass allows you to draw circles anywhere from 1.5 inches diameter to 28 inches diameter. A small spacer is optional to help keep your pencil vertical. The two halves are tightened together with 1/4-inch bolts and 1/4-inch wing nuts. You can use two sets to help keep everything straight or just one to utilize the full size capabilities of the setup. The hole that mounts the center to your work piece is also designed to work with a 1/4-inch bolt. A standard #2 pencil should work fine.
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