Abstract: A machine tool has a hollow drive spindle with a work holder attached thereto for holding work submerged in a machine liquid, such as mineral oil, contained in a machining chamber. The work is machined in the submerged state as a cutting tool is fed against the work rotating with the drive spindle. The machining liquid is additonally utilized for hydrodynamically loading the work on the work holder by drawing the liquid from the machining chamber into the hollow in the drive spindle, and for unloading the completed product from the work holder by forcing the liquid back into the machining chamber through the hollow in the drive spindle. A removable chip recovery vessel is provided for the recovery of the metal chips and particles from the machining liquid by recirculating it through the vessel. The machine tool can take various other arrangements for the performance of a variety of cutting operations.

Abstract: An automatic tool changer for a machine tool of the type having an upstanding spindle rotatably mounted to a spindlehead for joint vertical displacement therewith between a lower machining position and an upper retracted position via a tool change position therebetween. The tool changer includes an indexing tool magazine rotatable about a fixed slanting axis and carrying a set of cutting tools at prescribed angular spacings for successively bringing them to a position of axial alignment with the spindle. Also included are a chuck control cam for controlling the chucking and unchucking of the successive cutting tools to and from the spindle, and a gripper control cam for actuating a pair of gripper jaws releasably holding each cutting tool on the tool magazine. The tool magazine, chuck control cam and gripper control cam are all driven mechanically from a common drive motor for quick, reliable tool changing operation.