I recently built a set of display cases that had tamboured doors with 1/4-in. thick edges. I wanted the grooves in which they ran to be 1/32-in. wider so the tambour wouldn’t bind. To accomplish this I applied iron-on veneer edging tape around half the radius of my router base. To cut the groove I ran the router base along a template using a 1/4-in. straight bit. On the first pass I kept the router’s original base against the template. On the second pass I rotated the router so the taped portion of the base bore against the pattern, thereby adding about 1/32 in. to the groove width.

Andrew Dey, Wallingford, Conn.

Fine Woodworking Magazine, December 1985 No. 55

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