An embodiment of a circular, annular tool magazine shelf of a tower construction, comprises a base frame adapted for receiving a tool shelf which has a plurality of immovable tool deposit plates, arranged in vertical succession and in a circular ring, adapted for machining one or more tools, and a power-driven tool handling system adapted for transporting tools between the tool magazine shelf and a machine-side pick-up tool magazine store. The magazine shelf also comprises a spindle tower which is mounted rotatably about a vertical rotation shaft being arranged in a circle center-point of one or more tool deposit plates, wherein the base frame includes a monolithically constructed, plate-shaped foundation in which the rotation shaft is mounted overhanging freely by way of a mounting arrangement.

A spring urged tool holder clamp for CNC tool holder magazines that hold a variety of cutting and milling tools for automatic tool changes to a spindle for milling. The individual tool holders are removably secured and held by resilient clamping that frictionally engages the tool holder in place. Independent pivoted opposing engagement jaws on the tool holder clamp diminishes wear and maintains precise positioning of the tool holder critical to the automatic tool loading.

A machine tool changer includes a manipulator; a manipulator mounting arm; a manipulator mounting base; a manipulator rotation driving mechanism; a manipulator swinging driving mechanism; and a manipulator horizontal moving driving mechanism. The manipulator is mounted on the manipulator mounting arm, which is mounted with the manipulator rotation driving mechanism for driving the manipulator to rotate around a horizontal axis. The manipulator mounting arm is mounted on the manipulator mounting arm, which is mounted with a manipulator swinging driving mechanism for driving the manipulator mounting arm to swing around the horizontal axis. The manipulator mounting base is mounted with the manipulator horizontal moving driving mechanism for driving the manipulator mounting base to move horizontally to make the manipulator approach or move away from a machine tool spindle.