controlling path of groove router bit
brucet9
| Posted in Jigs, Fixtures, Tips & Tricks on
I’m making three thin korbels to support a 10″ overhang of a granite counter top. I plan to cut 10″ x 12″ triangles out of 1 1/8″ glue-up shelf material and truncate both points of the hypotenuse by 2″ .
I can easily route the edges to sort of match the profile on the cabinet door edges, but I also want to use a cove and bead groove bit about 2″ in from the edges to to give them something of the appearance of raised panels.
While cutting this triangular groove with my router, how do I control the lengths of the passes along each side such that they form a triangle without one groove going beyond the intersection with another?
Replies
I would set up a plunge router to guide the bit with a bushing and make a guide from plywood or MDF with an appropriately sized triangular cut out to make the cut. The three corners in the guide should be the same diameter as the bushing.
The layout of the guide is easy. To start, draw a triangle on the plywood dimensioned for the centerline of the groove you want to cut. Now drill a bushing sized hole centered on the intersections of the lines at each corner. The last step is to saw away the inner triangle so you have a triangular cut out with the three sides blending into the outer edges of the holes you drilled.
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