Radius cutting edging tool with guide wheel

A rotary tool for edge dressing a piece of work mounted on a supporting base wherein the edge of said piece of work projects a slight distance beyond the edge of said supporting base, comprising:

• (a) a shank means adapted to be removably gripped by rotatable chuck means;
• (b) a cutter body connected to said shank means below that portion of said shank means that is adapted for gripping;
• (c) a plurality of cutter blade means connected to said cutter body, initiating at said cutter body and extending radially therefrom;
• (d) a ball bearing guide wheel mounted coaxially with and to said shank means below said cutter body so that the outer periphery of said guide wheel can rotatably ride on the edge of said supporting base independently of any rotary movement of said cutter blade means, said wheel supporting said cutter blades in spaced relation to the edge of said supporting base;
• (e) said cutter blade means having a cutting edge shape for edge dressing said piece of work to produce a cut edge in said piece that is flush with the edge of said base at their point of contact and that extends upward toward the surface of said piece in a substantially straight line at an acute angle relative to said edge of said base and inward from said edge for a first portion of the distance to the surface, and that extends the second portion of the distance to the surface in an arc, said arc being substantially the arc of a circle whose radius is within thirty percent of the thickness of said piece of work.