Abstract: A tool and workpiece arrangement for material-removing machining includes a primary holder and a replaceable secondary holder which is mounted on the primary holder, and which carries a tool or a workpiece. The primary holder is provided at its end face, which cooperates with the secondary holder, with portions which extend crosswise with respect to one another around an unprofiled central region at mutually displaced sides so as to be parallel at respective mutually opposite sides, and which have respective flanks. The corresponding end face of the replaceable secondary holder is contoured in a corresponding or complementary manner.

Abstract: The coordinate slides of a peripheral device for machine tools, are guided in a guide and are manually advanced for purposes of coarse adjustment. For purposes of fine adjustment, each coordinate slide can be coupled with an associated fine-adjustment pinion gear by means of non-positive clamps. The clamps, positioned on the slide, are often capable of being activated only with a lot of grouping around on the part of the operator making the adjustment. In the peripheral equipment in accordance with the invention every clamping element is electrically activated so that the activating switch can be positioned convenient to reach next to the activating member of the fine-adjustment pinion gear. Adjusting the equipment is accordingly essentially facilitated.

Abstract: The head of the boring bar of a boring tool has a recess flanked by two toothed internal surfaces which extend forwardly and outwardly with respect to the axis of the bar and face each other. The bit carriers have toothed surfaces which engage the respective internal surfaces and are clamped against such internal surfaces by screws whose shanks extend into tapped bores of the head. The axes of the tapped bores make an acute angle or are parallel with the axis of the bar, depending on the diameter of the bar. Each carrier has an elongated slot for the shank of the respective clamping screw, and each carrier can be shifted lengthwise of the respective teeth by a discrete adjusting screw which meshes with the bar.

Abstract: There is disclosed a presettable tool supporting device for machine tools which permits the tool to be preset in its tool holder away from the machine and then quickly and easily mounted on the machine in an accurately predetermined position, thus eliminating the need for adjusting the tool on the machine.