Spindle apparatus for use at a machine tool, in particular a lathe, and machine tool with such spindle apparatus

A spindle apparatus for use at a machine tool, comprising:

• a spindle assembly including:
• a workpiece spindle being configured to receive an elongated workpiece and
• a spindle motor for driving a spindle rotation of the workpiece spindle about a spindle axis of the workpiece spindle;
• and
• a rotary guide-bush assembly being axially arranged with the workpiece spindle with respect to the spindle axis, the rotary guide-bush assembly including a rotary guide-bush configured to receive the elongated workpiece and being supported at the rotary guide-bush assembly to rotate with the elongated workpiece received in the workpiece spindle about the spindle axis while enabling a movement of the elongated workpiece in the direction of the spindle axis;
• wherein the spindle assembly and the rotary guide-bush assembly are configured to connect to each other by a torque transferring connection arranged between the spindle assembly and the rotary guide-bush assembly along the spindle axis so as to transfer driving torque during acceleration or deceleration of the spindle rotation driven by the spindle motor to the rotary guide-bush of the rotary guide-bush assembly, and
• wherein the torque transferring connection includes an extensible joint structure attached to the spindle assembly and the rotary guide-bush assembly, the extensible joint structure being configured to transfer driving torque during acceleration or deceleration of the spindle rotation and being further configured to elastically elongate and/or shorten in the direction of the spindle axis.