Abstract: A tool changing device for a lathe of the type having a base structure with parallel column guides for longitudinal movement of a tool storage and changing device. The tool changer disclosed is a generally circular tool magazine, a cross slide member mounted on the longitudinal guide means of the lathe, the magazine surrounding one of the longitudinal guides. The tool changer is rotatably movable to select one of a plurality of tools circularly disposed thereon to bring the desired tool to a position adjacent the axis of rotation of a workpiece supported on the lathe. When the selected workpiece is in position, the apparatus establishes a rigid and direct connection between the selected tool holder and the lathe with the tool holder remaining on the magazine. Seals are provided to prevent turnings and other dirt from entering the tool changing mechanism.

Abstract: A lathe bed includes a steel reinforced concrete body with a torsionally flexible frame and means for rigidly connecting the ends of the frame to the body. The frame includes track members for a tool carrier. In one embodiment, the frame is made of two elongated box-like side members and two transverse column guide members, the side members being fixedly attached as by screws to the concrete body and the column guide members being fixedly attached to the side members. In another embodiment, one side member is used and the two column members extend between the side member and a wall portion of the body at the other end. The body is shaped to permit clearance for turnings removed from a workpiece and for a multiple tool magazine. The headstock, feed drive, longitudinal slides and tailstock are mounted on the frame. The body contributes rigidity to the otherwise torsionally flexible frame to produce a rigid and sturdy unitary lathe bed.