This attachment mounts in place of your router’s factory baseplate and is used for cutting circular disks from, or boring circular holes in, sheet stock. It pivots about a small pin rotating in a blind hole drilled in the center of the stock to be cut. This one is based on a design from Bill Hylton’s excellent book Router Magic.
As much as I like Hylton’s project, I wanted to design a DIY trammel that did not require any table-mounted tools or expensive router bits for its construction. My version is laminated from three layers of quarter-inch stock, and replaces Hylton’s custom-milled T-slot and matching arm with a short piece of aluminum 80/20 rail, which is inexpensively available. The arm can be reversed in the slot to cut small radii, and Hylton’s dimensions have been slightly modified to provide a continuous range of possible diameters of about 2-22″.
6 thoughts on “Make: Projects – Router Trammel”
Put a tape measure (I have a drawer full of broken tapes, or use a fabric tape) on the rail and you can quickly adjust the diameter without having to do a lot of measuring. Don’t forget the bit radius when you set it!
OOOO always wanted something like this!
do you just lightly nail it in the middle?
always wanted something like this!!!
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