Self-centering drill bit with pilot tip

Details Self-centering drill bit with pilot tip Self-centering drill bit with pilot tip

B - Operations, Transporting

23

B

77/34

B23B 51/02 (2006.01)

Patent

CA 1298994

ABSTRACT SELF-CENTERING DRILL BIT WITH PILOT TIP A self-centering twist drill bit (20) is formed with a "fishtail" cutting section (32) having major cutting lips (72, 74) on a working end (26) thereof at a point angle of 190°. Tip relief surfaces (76, 78) trail cutting lips (72, 74). A pilot tip (38) on the working end (26) extends axially from the "fishtail" cutting section (32) and is formed with a split point having leading cutting edges (40, 42) and minor cutting lips (46, 48). Outer surfaces (58, 60) of pilot tip (38) are each formed with a radial relief and a back taper and joins with cutting section (32) along fillets (92, 100) which are also radially relieved.

544728

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