US 12,226,861 B1
Constant rake fluted drill bit and method of manufacture
Jeffrey Bonner, Naples, FL (US)
Filed by Jeffrey Bonner, Naples, FL (US)
Filed on Feb. 19, 2024, as Appl. No. 18/581,321.
Claims priority of provisional application 63/447,623, filed on Feb. 22, 2023.
Int. Cl. B23P 15/32 (2006.01); B21K 5/04 (2006.01); B23C 3/32 (2006.01); B24B 19/04 (2006.01); B23B 3/26 (2006.01); B23B 3/30 (2006.01); B23B 5/48 (2006.01); B23B 25/06 (2006.01)
CPC B23P 15/32 (2013.01) [B21K 5/04 (2013.01); B23C 3/32 (2013.01); B24B 19/04 (2013.01); B23B 3/26 (2013.01); B23B 3/30 (2013.01); B23B 5/48 (2013.01); B23B 25/06 (2013.01); B23B 2220/12 (2013.01); B23B 2228/24 (2013.01); B23B 2260/0482 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method of fabricating a drill bit, the method comprising steps of:
(a) securing a drill bit blank stock in a machine;
(b) initiating a rotation of a machining wheel;
(c) a drawing together motion bringing at least one of the rotating machining wheel and the drill bit blank stock towards the other of the rotating machining wheel and the drill bit blank stock at a location proximate a drill bit shank section of the drill bit blank stock, the drawing together motion being in a direction generally perpendicular to a longitudinal axis of the drill bit blank stock;
(d) initiating a linear motion and a rotational motion of the drill bit blank stock to cut a helical flute when the rotating machining wheel is prior to or at a depth of cut of the helical flute, wherein the linear motion and the rotational motion are performed simultaneously during the process of cutting the helical flute;
(e) removing material from the drill bit blank stock using the rotating machining wheel, while the drill bit blank stock remains moving in the combined simultaneous linear and rotational motion to create the helical flute from a shank sided end of a cylindrical helical flute section to a free end of the cylindrical helical flute section, wherein step (e) transitions the drill bit blank stock into a partially completed drill bit,
(f) ceasing the rotational motion of the partially completed drill bit when a distal radial edge of the rotating machining wheel reaches a position proximate a leading end of the partially completed drill bit,
(g) ceasing the linear motion of the partially completed drill bit and radially separating the rotating machining wheel and the partially completed drill bit from one another, the radially separating motion being in a direction generally perpendicular to the longitudinal axis of the partially completed drill bit and in a direction opposite to the drawing together motion, wherein step (g) transitions the partially completed drill bit into a formed drill bit;
wherein step (g) creates a flat rake surface, wherein the flat rake surface extends axially between the free end of the cylindrical helical flute section created in step (e) and the leading end of the partially completed drill bit, the flat rake surface extending radially outward from a crease of the helical flute to a circumferential surface of the partially completed drill bit.