Abrading – Abrading process – Drill – thread – thread cutter – reamer – or rotary cutter abrading
Reexamination Certificate
2007-04-24
2007-04-24
Van Nguyen, Dung (Department: 3723)
Abrading
Abrading process
Drill, thread, thread cutter, reamer, or rotary cutter abrading
C451S047000
Reexamination Certificate
active
11108405
ABSTRACT:
A precision cemented carbide threading tap is designed for use in precision tool holders in synchronous high speed tapping. The precision tap includes a fully cylindrical shank without the aid of squares, flats or other notches. The precision tap further includes a threaded body portion and a threaded cutting chamfer portion. The threaded body portion and the threaded cutting chamfer portion of the precision tap are concentric to the cylindrical shank of the tap within a runout of 10 microns. The precision cemented carbide threading tap improves the accuracy, life and speed by which internal screw threads are produced.
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Akaki Sadayuki
Henderer Willard E.
Kennametal Inc.
Meenan Larry R.
Nguyen Dung Van
Yamawa Mfg. Co., Ltd.
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