Workpiece mounting apparatus for an internal grinding machine

摘要

A workpiece mounting apparatus in which a measuring gauge for measuring a cylindrical bore of a workpiece is provided with a tapered portion thereon and is fixedly mounted on a shiftable rod which in turn is slidably mounted within a spindle. The measuring gauge projects from a reference face plate on a chuck housing a predetermined amount as a result of axial movement of the shiftable rod so as to align the axis of the workpiece with the axis of the spindle. When the workpiece is clamped on the reference plate by clamping means, the tapered portion of the measuring gauge is engaged with the cylindrical bore of the workpice. Thus, axial alignment between the spindle and the workpiece is established by confirming the engagement of the tapered portion of the measuring gauge and the bore of the workpiece by means of a detector and thereafter, the tapered portion thereof is extracted from the cylindrical bore of the workpiece.