In this segment, host David Thiel shows you a viewer jig that accurately cuts radius profiles with a router. John in Palo Alto, California sent in this jig idea. The jig cuts perfect radii with a router using a swinging arm.The plunge router is set into one end of a swinging arm. The other end of the arm is attached to a board. That end is the pivot point for the swinging arm. Several holes are cut into the arm one inch apart allow you to use the jig for several different radii.
Here’s how to make the jig: 1. Use a plywood backboard as the base of the unit. This will be the piece the radius is cut into. 2. Cut a piece of 1 x 4 the same length as the base. 3. Two boards cut at an angle act as stops (figure A) on either side of the arm. Attach them to the piece of 1 x 4. 4. Use a band saw to cut the arm from 1/4" plywood. Make sure that the head of the arm is the appropriate size for the base of your router. 5. Use a Forstner bit (figure B) to cut the hole for the router bit in the head of the arm.
6. Drill holes 1" apart into the base of the arm. 7. Attach the arm to the center of the piece of 1 x 4 with a bolt and washer (figure C). The arm should be secure, but not permanent. You will have to loosen the bolt to make a different size radius using another hole in the arm. 8. Place your router on the arm and turn it on. Swing the arm to make a radius cut in the plywood (figure D, figure E).
RESOURCES :
Ryobi Router
Ryobi Technologies, Inc.
1428 Pearman Dairy Road
Anderson, SC 29625
Phone: 800-323-4615
Website: www.ryobitools.com
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