Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Reexamination Certificate
2011-03-08
2011-03-08
Howell, Daniel W (Department: 3726)
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
C409S083000, C409S144000, C409S145000
Reexamination Certificate
active
07901163
ABSTRACT:
A gun drill having excellent cutting efficiency, having high deep-hole drilling efficiency, and having a prolonged blade service life has a cutter head having a coolant discharge port communicating with a coolant supplying path at the distal end face at the distal end of a hollow shank portion having a cutting chip discharge groove, whose section along the lengthwise direction is V-shaped, on the outer surface and having the interior thereof made into a coolant supplying path, wherein a blade portion of the cutter head is made of cemented carbide alloy, and at the same time, the guide pads and that are brought into sliding contact with the inner circumference of a cutting bore are composed of a dissimilar material having higher hardness than the cemented carbide alloy.
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CRC Handbook of Chemistry and Physics, Editor in Chief: Robert C. Weast, The Chemical Rubber Company, published 1964, p. F-15.
Howell Daniel W
Unitac, Inc.
Womble Carlyle
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