Workpiece support

Abstract

A workpiece support ( 1 ) for removing material from a dental workpiece ( 2 ) which is held by the workpiece support ( 1 ) and is rotated together with the workpiece support ( 1 ) about a drive rotation axis ( 3 ) when material is being removed. The workpiece support ( 1 ) has at least two workpiece support parts ( 4, 5, 6 ) which can be separated from each other and connected to each other. One of the workpiece support parts ( 4, 5 ) has at least one compensation region ( 7 ) with a material projection ( 8 ) for introducing a compensation surface ( 9 ) by removing material, and the other workpiece support part ( 6 ) has a seating surface ( 10 ) for connecting to the compensation surface ( 9 ) in a formfitting manner.

1 . A workpiece support for machining of a dental workpiece, which is retained by the workpiece support and, during the machining, is rotated together with the workpiece support about an drive rotation axis, the workpiece support comprising at least two workpiece-support parts, which are separable from one another and connectable to one another, one of the workpiece-support parts has at least one compensation region with a material overhang for forming a compensation surface by way of material removal, and another one of the workpiece-support parts has a seat surface for form-fitting connection to the compensation surface. 
     
     
         2 . The workpiece support as claimed in  claim 1 , wherein the seat surface encases a cavity, into which the compensation surface is introduced for the form-fitting connection of the seat surface to the compensation surface. 
     
     
         3 . The workpiece support as claimed in  claim 1 , wherein the seat surface is at least in part in the form of a cylinder shell or of otherwise rotationally symmetrical shaping. 
     
     
         4 . The workpiece support as claimed in  claim 1 , wherein one of the workpiece-support parts has a fastening device for fastening the workpiece support on a driveshaft of a machine tool, said driveshaft being rotatable about the drive rotation axis, and the other workpiece-support part, or another of the workpiece-support parts, has a workpiece adapter for fastening the workpiece on the workpiece support. 
     
     
         5 . The workpiece support as claimed in  claim 1 , wherein at least one of the workpiece-support parts has a longitudinal stop formed thereon with a material overhang, the longitudinal stop is shortenable by way of material removal. 
     
     
         6 . The workpiece support as claimed in  claim 1 , wherein the workpiece support has at least three of the workpiece-support parts, wherein at least one of the compensation region, the longitudinal stop, or the skewing-prevention component is formed on a central one of the workpiece-support parts, which is arranged between two of the other workpiece-support parts. 
     
     
         7 . A method of correcting an axial position of a workpiece support as claimed in  claim 1 , the method comprising fastening the workpiece-support part with the compensation region on a driveshaft of a machine tool, said driveshaft being rotatable about the drive rotation axis, and then, removing material along with simultaneous rotation of the driveshaft together with the workpiece-support part about the drive rotation axis, forming the compensation surface in the compensation region using a material-removing tool of the machine tool. 
     
     
         8 . The method as claimed in  claim 7 , wherein the compensation surface is formed at least in part as a cylinder shell or of otherwise rotationally symmetrical shaping, and an axis of symmetry of the cylinder-shell or otherwise rotationally symmetrical shape of the compensation surface is coaxial with the drive rotation axis. 
     
     
         9 . The method as claimed in  claim 8 , wherein surface regions which may be present in the compensation region and differ from the cylinder-shell or otherwise rotationally symmetrical shape are located closer to the axis of symmetry than the cylinder-shell or otherwise rotationally symmetrical shape of the compensation surface. 
     
     
         10 . The method as claimed in  claim 7 , further comprising fastening the workpiece support for machining of the dental workpiece on the driveshaft of the machine tool, said driveshaft being rotatable about the drive rotation axis, in the same way, and on the same driveshaft, as the workpiece-support part with the compensation region was fastened in order for the compensation surface to be formed in the compensation region. 
     
     
         11 . The workpiece support as claimed in  claim 1 , wherein at least one of the workpiece-support parts has a skewing-prevention component machined from a material overhang thereon.