Claims
- 1. An elongated grooving and threading tool of the type having a longitudinal axis and radially projecting cutting edge, said tool comprising a cutting section having an axially extending bore and a radially projecting cutting edge,
- an other section, said other section comprising a hollow cylindrically shaped cemented carbide section,
- a connection formed at the juncture of said cutting section and said other section, said connection comprising a transversely positioned key and a keyway, said other section being provided with said keyway, said connection including a pair of first and second surfaces, said first surfaces and said second surfaces, respectively, extending on either side of said respective key and said keyway substantially within a plane perpendicular to said axis of rotation, said first surfaces being adapted to mate with said second surfaces to align said cutting section and said other section along the longitudinal axis, and said first surfaces and said second surfaces, respectively, comprising a major portion of the cross-sectional area of said tool,
- a drawbar connected between said cutting section and said other section for holding said sections in axial alignment along said axis, said drawbar including a cylindrically shaped enlarged means for centering said drawbar relative to said other section for preventing relative radial movement between said cutting section and said other section while permitting axial movement therebetween whereby the tolerance of the inside diameter of said other section is held at a total tolerance of less than about ten ten thousandths of an inch, said drawbar being under tension for holding said connection under a compressive force, said drawbar including a nut for securing said drawbar to the rearward portion of said other section.
- 2. An elongated grooving or threading tool having a longitudinal axis comprising a cutting section having an axially extending bore and a radially extending cutting edge and a hollow cylindrically shaped cemented carbide section,
- a connection being formed at the juncture of said cutting section and said cemented carbide section,
- a drawbar connected between said cutting section and said cemented carbide section for holding said sections in axial alignment along the longitudinal axis and holding said connection under compression for increasing the stiffness of the tool, said drawbar extending entirely through said axially extending bore,
- said connection comprising a transversely positioned key one of said sections and a transversely positioned keyway being provided on said other of said sections, said connection including a pair of first and second surfaces,
- said first surfaces and said second surfaces, respectively, extending on either side of said respective key and said keyway substantially within a plane perpendicular to said axis of rotation,
- said first surfaces being adapted to mate with said second surfaces to align said cutting section and said cemented carbide section along the longitudinal axis, and
- said first surfaces and said second surfaces, respectively, comprising a major portion of the cross-sectional area of said boring tool.
- 3. An elongated grooving or threading tool according to claim 2 wherein said draw bar includes an enlarged end for engaging said cutting section.
- 4. An elongated grooving or threading tool according to claim 3 wherein said drawbar includes a nut for securing said drawbar to the rearward section.
- 5. An elongated grooving and threading tool according to claim 1 wherein whereby the tolerance of the inside diameter of said other section is held at a total tolerance of less than about five ten thousandths of an inch.
Parent Case Info
This is a continuation of copending application Ser. No. 07/488,474 filed on Feb. 26, 1990, now abandoned, which is a continuation of 07/261,309, filed Oct. 24, 1988, now abandoned.
US Referenced Citations (8)
Continuations (2)
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Number |
Date |
Country |
Parent |
488474 |
Feb 1990 |
|
Parent |
261309 |
Oct 1988 |
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