Abstract: A spindlehead arrangement having a headstock and a driving spindle motor mounted separately of each other for vertical movement on separate tracks. The headstock is capable of being removed from its set of supporting tracks without necessitating a removal of the spindle driving motor. A releasable connection is provided between the headstock and the spindle driving motor to facilitate a movement of the headstock and the spindle driving motor in unison along the track. A counterbalance weight is provided for counterbalancing the weight of the headstock and the weight of the spindle driving motor.

Abstract: A multiple-spindle unit capable of being mounted onto an otherwise standard spindlehead in a tool machine. The multiple-spindle unit is driven by the spindle of the tool machine. A changing arm is utilized for connecting the drive member for the multiple-spindle unit to the spindle of the tool machine and thereafter the multiple-spindle unit is mounted on the spindlehead.