Twist drill with negative axial rake transition between the lip and the secondary cutting edge

A drill for making a hole within a workpiece, wherein the drill is comprised of:

• a) a body extending along a longitudinal axis;
• b) at least one flute extending along the body;
• and
• c) a drill point extending from the end of the body, wherein the drill point has a periphery and end segments about the longitudinal axis;
• wherein each end segment is comprised of:
• 1) a chisel edge extending outwardly from the longitudinal axis to a chisel edge outer end;
• 2) a primary cutting edge extending inwardly from the periphery;
• 3) a secondary cutting edge extending outwardly from the chisel edge outer end, wherein the secondary cutting edge has a positive or neutral axial rake angle;
• 4) a tertiary cutting edge connecting the primary cutting edge with the secondary cutting edge, wherein the tertiary cutting edge has a negative axial rake angle;
• and
• 5) a clearance behind the primary cutting edge, the clearance comprising:
• a flank behind the primary cutting edge, the flank being angled to extend away from the chisel edge toward the body and define a first clearance, and
• a clearance face behind the flank, the clearance face being angled to extend away from the chisel edge toward the body and define a second clearance.