Method of forming a notched edge lock screw

Claim 1

A method of forming a notched edge lock screw having a threaded shank and a head provided with a notch, and being of the type used for locking a die part insert within a retainer which is provided with a socket for receiving a portion of the insert, and with the insert having a lock-screw head receiving groove aligned with a seating surface formed on the retainer and the seating surface surrounding a threaded lock screw shank receiving opening so that the base of the lock screw head tightly engages the seating surface when a portion of the screw head overlaps the retainer socket and is received within the insert groove for locking within the retainer socket, and the screw head base is spaced a short distance from the seating surface when the screw is loosened relative to the threaded opening for aligning the notch formed on the screw head with the adjacent socket edge portion and insert edge portion so that the insert is unlocked, comprising: forming an un-notched master screw, which otherwise is a substantial duplicate of the lock screw, with a substantial number of segment markings equally spaced around the peripheral edge portions of its head, so that the head circumference is visually divided into a large number of segments; applying said master screw into a pre-existing retainer threaded opening and observing the markings which delineate the portion of the socket which is overlapped by the head of the master screw when the master screw is tightly in place; machining a notch in a lock screw corresponding to, but circumferentially offset relative to, the observed marked overlapping master screw head portions, so as to position the notch with one of its ends at the retainer socket defining wall, so that the notch extends roughly perpendicularly away from the retainer socket defining wall when the lock screw head is tightly in contact with the retainer seat surface; and thereafter, threadedly applying said lock screw to said preexisting retainer opening for use therein.

Claim 2

A method of forming a notched edge lock screw having a threaded shank and a head provided with a notch, and being of the type used for locking a die part insert within a retainer which is provided with a socket for receiving a portion of the insert, and with the insert having a lock-screw head receiving groove aligned with a seating surface formed on the retainer and the seating surface surrounding a threaded lock screw shank receiving opening so that the base of the lock screw head tightly engages the seating surface when a portion of the screw head overlaps the retainer socket and is received within the insert groove for locking within the retainer socket, and the screw head base is spaced a short distance from the seating surface when the screw is loosened relative to the threaded opening for aligning the notch formed on the screw head with the adjacent socket edge portion and insert edge portion so that the insert is unlocked, comprising: forming an un-notched master screw, which otherwise is a substantial duplicate of the lock screw, with a substantial number of segment markings equally spaced around the peripheral edge portions of its head, so that the head circumference is visually divided into a large number of segments; applying said master screw into a pre-existing retainer threaded opening and observing the markings which delineate the portion of the socket which is overlapped by the head of the master screw when the master screw is tightly in place; machining a notch in a lock screw corresponding to, but circumferentially offset relative to, the observed marked overlapping master screw head portions, so as to position the notch with one of its ends at the retainer socket defining wall, so that the notch extends roughly perpendicularly away from the retainer socket defining wall when the lock screw head is tightly in contact with the retainer seat surface; and thereafter, threadedly applying said lock screw to said preexisting retainer opening for use therein.