The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2003
Filed:
Nov. 15, 2001
Hiroshi Mizuguchi, Yamatokoriyama, JP;
Masaaki Yokoyama, Yamatokoriyama, JP;
Munetaka Wakizaka, Yamatokoriyama, JP;
Mori Seiki Co., Ltd., Yamatokoriyama, JP;
Abstract
The present invention provides a numerical control apparatus for a machine tool, which corrects an axial displacement of a main spindle caused due to a change in preload level and occurring according to the rotation speed of the main spindle. The numerical control apparatus ( ) comprises: a numerical control section ( ) for numerically controlling the movement of a spindle head ( ) and for outputting a rotation command; a spindle control section ( ) for controlling the rotation of a main spindle ( ); a preload change control section ( ) for changing the level of a preload applied to bearings ( ); and a correcting section ( ) for outputting correction data for correction of an axial displacement of the main spindle ( ) caused due to a change in the preload level and occurring according to the rotation speed of the main spindle ( ) to the numerical control section ( ) on the basis of the rotation command.