Cutting by use of rotating axially moving tool – Tool of specific diverse material
Reexamination Certificate
2006-12-05
2006-12-05
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool of specific diverse material
C076S115000, C408S222000, C470S198000
Reexamination Certificate
active
07144208
ABSTRACT:
A low torque tap includes a shank portion with a driving square and a thread cutting portion. The thread cutting portion includes a threaded body with one or more asymmetrical straight flutes that run essentially parallel to a longitudinal axis of the tap. The thread cutting portion also includes one or more short angular flutes or spiral points and a tapered chamfer. For tapping steel alloys, the cutting edges of the straight flutes and the spiral points have a rake or chordal hook angle of between about 5 and 15 degrees. For tapping ferrous materials, the tap is made from molybdenum-enriched high-speed steel and may be coated with a wear-resistant, friction-reducing layer. A second, outer layer, such as molybdenum disulfide, may be applied over the wear-reducing layer for further reduction in friction. For tapping non-ferrous materials, the tap may be coated with a layer of material containing carbon.
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Barrows Alan L.
Burns Steven R.
Greene Dennis J.
Henderer Willard E.
Howell Daniel W.
Kennametal Inc.
Meenan Larry R.
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