Patent ID: 7404769

Claim:
A method of making a punch for forming a recess in the top surface of the head of a fastener, said recess having multiple radially inward extending lobes that define spirally configured driving surfaces, said driving surfaces extending substantially axially, from outward facing top surfaces of the lobes towards the bottom of the recess, said driving surfaces constructed for engagement with a mating drive tool for rotating said fastener in installation and removal directions about a longitudinal axis, said method comprising the steps of: forming a substantially cylindrical, axially aligned, bore in a die blank, forming multiple lobes in said bore to define the multiple driving surfaces of the fastener recess; constructing a non-driving ramp surface on each of said multiple lobes of said die on outward facing surfaces thereof, said ramp surfaces being recessed a predetermined depth in a counterbore in said bore, each of said ramp surfaces further comprising: an installation ramp portion extending radially inward and circumferentially in the installation direction from an apex of said ramp surface, wherein said installation ramp portion declines from the apex at a compound angle both radially and circumferentially; and a removal ramp portion extending radially inward and circumferentially in the removal direction from the apex of said ramp surface, wherein said removal ramp portion declines from the apex at a compound angle both radially and circumferentially; wherein said installation ramp portion and said removal ramp portion are adapted to urge a rotating drive tool into mating engagement with the drive surfaces in either the installation or removal directions; and cold forming the punch by pressing a punch blank into said die.