Patent ID: 6637989
Filing Date: 2003-10-28
Classification: B23B,Y10T

Abstract:
In a cutting tool for removing material from a work piece, the cutting tool of a type having a body adapted for rotation in a predetermined direction about an axis of rotation relative to the work piece and having a driver engaging end and an opposite work engaging end, the work engaging end having first and second portions, the first portion having a first boundary defined by a cutting edge extending in a direction transverse to the axis of rotation and the second portion having a second boundary running in a direction transverse to that of the cutting edge, the cutting edge having medial and distal ends of which the medial end is located nearer to the axis of rotation and the distal end is located nearer to a side surface of the body, the second boundary of the second portion having medial and distal ends of which the medial end is located nearer to the axis of rotation and the distal end is located nearer to the side surface of the body, the improvement comprising:an opening through which a cutting tool operator can view a punch mark or other indication on the work piece to permit the cutting tool operator to visually place the medial end of the cutting edge at a location where the center of an intended hole is to be located, the opening located between the medial end of the cutting edge and the medial end of the second boundary, and the medial end of the cutting edge positioned at the axis of rotation.