Patent ID: 7040843

Claim:
A cutting tool for forming flat bottomed grooves in the backs of flooring planks, the tool comprising in combination: a tool body having a plurality of positions for supporting cutting inserts; a plurality of cutting inserts supported on the tool body in said positions; each cutting insert: (a) being shaped as regular octagon having eight identical cutting edges relatively displaced by 45 degrees and having A-edges alternating with B-edges, (b) being arranged such that when it is indexed in the tool body with an A-edge positioned to cut the flat bottom of a groove, each of the adjacent B-edges is oriented to cut a 45 degree groove sidewall, (c) having a conical dished face on the unsupported side of the insert, and an aperture in dished face projecting through the insert, a matching conical-faced nut positioned in the dished face of the insert, and a threaded fastener projecting through the tool body, the insert and into the nut to accurately lock the insert to the tool body in indexed position, the threaded fastener being releasable to allow the tool to be re-indexed.