Patent ID: 7347769

Claim:
A method of removing material from an elongate non-metallic workpiece to produce an operative face with a tapered groove, a back face and opposed sides connecting said faces, said method comprising the steps of: providing a supporting anvil adapted to support the back face of the workpiece and to move the workpiece longitudinally in a workpiece direction aligned with said groove; providing an abrasive tool having a longitudinal working surface spaced from said anvil and adapted to engage said operative face and move in a working direction opposite the workpiece direction, said working surface having a base surface and an elongate ramp surface aligned with said groove, abrasive particles in a pattern on said ramp surface having a maximum width portion corresponding to the width of said groove and a narrowing continuum progressively in the working direction to an apex portion; providing relative longitudinal motion between said anvil and said tool in the working direction; and reducing the space between said anvil and said working surface whereby said pattern of abrasive particles at said maximum width engages said workpiece followed by successively narrower portions of the pattern engaging the workpiece until the working face is completely formed.