Patent Number: 6,637,307

Title: Method for machining a workpiece and chuck with a center pin forimplementing it

Abstract: In order to machine a workpiece on a machine-tool successively betweencenters and with the workpiece clamped in a chuck, the workpiece is heldduring at least one machining operation--and if necessary betweendifferent kinds of machining--through the axial pressure of a center pinclamped in a chuck of the machine-tool. To this end the chuck comprises anaxial center pin hydraulically movable in axial direction, which can beextended for enough towards the workpiece to be gripped by the jaws of thechuck, and which is journalled in at least one expanded sleeve bearing.

Inventors: Bohler; Erwin (Bettwiesen, CH)

Assignee:

International Classification: B23B 23/00 (20060101); B23B 31/30 (20060101); B23B 31/16 (20060101); B23B 31/02 (20060101); B23B 31/12 (20060101); B23B 031/00 (); B23B 005/22 ()

Expiration Date: 10/22015