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US 2008/0175682 A1Published application
Micro-adjustable differential screw assembly
AssigneeKennametal Inc.
InventorsJohn C. Musil, Thomas P. Quatkemeyer
Life of this patent
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AssigneeKennametal Inc.
InventorsJohn C. Musil, Thomas P. Quatkemeyer
Estimating the term…
A micro-adjustable differential screw assembly for providing fine adjustment of the axial and/or radial position of a cutting insert is disclosed. The micro-adjustable differential screw assembly can be mounted directly to a boring bar or to a mounting cartridge, which in turn, can be mounted to the boring bar. An axial micro-adjustable differential screw assembly provides fine adjustment of an axial position of the cutting insert, while a radial micro-adjustable differential screw assembly provides fine adjustment of a radial position of the cutting insert. The differential screw assembly includes a rotatable drive screw with threads of different thread pitches, and a non-rotatable adjusting screw with threads for mating with the drive screw. The difference in the thread pitches of the drive screw causes a greatly reduced axial and radial movement of the boring cartridge in relation to the relative movement of the drive screw, thereby providing fine adjustment in the axial and radial position of the cutting insert.
A boring bar, comprising:
A boring cartridge for a boring tool, comprising:
A micro-adjustable differential screw assembly comprising a rotatable drive screw including a shaft portion with a bore having internal threads with a first thread pitch and external threads with a second thread pitch different than said first thread pitch, and a non-rotatable adjusting screw including a shaft portion having external threads with said first thread pitch, said shaft portion of said adjusting screw being received in said bore of said drive screw.
A micro-adjustable differential screw assembly comprising a rotatable drive screw including a first portion having external threads with a first thread pitch and a second portion having external threads with a second thread pitch different than said first thread pitch, and a non-rotatable adjusting screw having internal threads with said first thread pitch, said second portion of said drive screw being received in a bore of said screw assembly.
Dependencies are inferred from the claim text.