Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Reexamination Certificate
2008-05-06
2008-05-06
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
C408S144000, C408S0010BD
Reexamination Certificate
active
10961060
ABSTRACT:
A ceramic drill bit comprising a cylindrical shank and a shaped portion extending axially in line with the shank and having a free end forming the tip of the bit, a relief face extending from each main cutting edge with a relief angle lying in the range 4° to 10° approximately relative to a plane perpendicular to the axis of rotation of the bit, and two notches forming two secondary cutting faces extending from the central edge with positive cutting angles lying in the range 1° to 7° approximately relative to the axis of rotation of the bit.
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Martinez Alain
Turrini Claude
Zerrouki Veronique
Howell Daniel W.
Snecma
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