Mandrel arrangement for clamping a workpiece , comprising - an expandable mandrel for engagement in a recess (23; 36) in the workpiece , - a counter bearing for direct or indirect abutment of the workpiece , - an actuator that is movable with respect to the mandrel along an actuation axis (BA) and comprises an expansion element , it being possible to expand the mandrel by means of a relative movement of the expansion element with respect to the mandrel in a clamping direction (VR) that extends in parallel with the actuation axis (BA), and the mandrel being designed to be movable relative to the counter bearing along the actuation axis (BA), and - a first resilient element by means of which the mandrel is preloaded with respect to the counter bearing away from the counter bearing against the clamping direction (VR), a base plate being provided, on which a front bearing is formed for abutment of the workpiece and a rear bearing is formed for abutment of the counter bearing , the base plate forming a recess (11; 30) into which the mandrel can be completely retracted along the actuation axis (BA) into the recess (11; 30) so as to be behind the front bearing , and a clamping device being provided, by means of which the actuator can be moved in the clamping direction (VR) toward the counter bearing and toward the base plate , characterized in that the base plate forms a guide for the mandrel , in particular by means of the recess (11; 30) in the base plate , and in that a second resilient element is provided by means of which the actuator is preloaded with respect to the mandrel against the clamping direction (VR). - an expandable mandrel for engagement in a recess (23; 36) in the workpiece , - a counter bearing for direct or indirect abutment of the workpiece , - an actuator that is movable with respect to the mandrel along an actuation axis (BA) and comprises an expansion element , it being possible to expand the mandrel by means of a relative movement of the expansion element with respect to the mandrel in a clamping direction (VR) that extends in parallel with the actuation axis (BA), and the mandrel being designed to be movable relative to the counter bearing along the actuation axis (BA), and - a first resilient element by means of which the mandrel is preloaded with respect to the counter bearing away from the counter bearing against the clamping direction (VR), a base plate being provided, on which a front bearing is formed for abutment of the workpiece and a rear bearing is formed for abutment of the counter bearing , the base plate forming a recess (11; 30) into which the mandrel can be completely retracted along the actuation axis (BA) into the recess (11; 30) so as to be behind the front bearing , and a clamping device being provided, by means of which the actuator can be moved in the clamping direction (VR) toward the counter bearing and toward the base plate , characterized in that the base plate forms a guide for the mandrel , in particular by means of the recess (11; 30) in the base plate , and in that a second resilient element is provided by means of which the actuator is preloaded with respect to the mandrel against the clamping direction (VR). <EOS>