A motor spindle including a sleeve-shaped stator, which has a first coupling receptacle and a second coupling receptacle, further including a rotor, which has a first coupling part with axial fixed bearing and a second coupling part with axial loose bearing, which are to be mounted to the respective coupling receptacle, the axial loose bearing comprising an inner ring mounted to the rotor shaft and an outer ring arranged coaxially with the inner ring and mounted to the second coupling part, wherein the second coupling part is received on the rotor shaft so as to be axially movable parallel to the rotor axis between a first functional position and a second functional position along an adjustment path and wherein for the entire adjustment path there is a first distance between a first axial surface of the inner ring and the second coupling part and there is a second distance between a second axial surface of the inner ring and the second coupling part.

Provided is a horizontal machine tool including a trunnion table and capable of being divided. The horizontal machine tool includes: a main frame; a spindle moving device disposed on the main frame; a spindle head supported by the spindle moving device in a movable manner in an X-axis direction, a Y-axis direction and a Z-axis direction, the spindle head having a spindle extending horizontally; a front frame disposed in front of the main frame; a trunnion table disposed on the front frame in a movable manner in a W-axis direction parallel to the Z-axis direction, the trunnion table rotatable about an A-axis parallel to the X-axis direction; and a connection block connecting the main frame and the front frame.