From the Loftsmith community

OF 1400 trammel jig with fine adjust

Lets you cut clean circles and arcs with a router, no wandering by eye. The base plate sits under the router, a long arm swings out to a centre pin, and a fine-adjust block gets the radius exactly right. Change the ply width and thickness to match your arm stock.

4 parts · 225 g · 728 × 176 × 35 mm