Abstract: In order to use moved masses which are as small as possible in a machine tool, in particular for the rotary machining of workpieces, comprising a machine frame, a tool carrier, a workpiece carrier, it is proposed to provide a parallel kinematic arrangement, which has three parallelogram guides connected in an articulated manner at one end to a receiving means for one of the carriers and at the other end to a slide and an N/C-controlled linear drive for each slide and by which the carrier arranged on the receiving means is movable relative to the machine frame in a three-dimensional movement space.

Abstract: In order to so improve a lathe comprising a machine frame, a first workpiece spindle with a vertical first spindle axis and a first workpiece holder, a first carriage system for moving the first workpiece spindle, a second workpiece spindle with a vertical second spindle axis, and a second workpiece holder facing the first workpiece holder, a second carriage system for moving the second workpiece spindle, the first workpiece spindle and the second workpiece spindle being adapted to be brought into a transfer position, that the machine frame can be manufactured in as simple and cost-efficient a manner as possible, it is proposed that the machine frame comprise a first machine bed and a second machine bed constituting an assembly separate from the first machine bed, and that the first carriage system be guided solely on the first machine bed, and the second carriage system be guided solely on the second machine bed.

Abstract: In order to so improve a lathe comprising a machine frame, a first workpiece spindle with a vertical first spindle axis and a first workpiece holder, a first carriage system for moving the first workpiece spindle, a second workpiece spindle with a vertical second spindle axis, and a second workpiece holder facing the first workpiece holder, a second carriage system for moving the second workpiece spindle, the first workpiece spindle and the second workpiece spindle being adapted to be brought into a transfer position, that the machine frame can be manufactured in as simple and cost-efficient a manner as possible, it is proposed that the machine frame comprise a first machine bed and a second machine bed constituting an assembly separate from the first machine bed, and that the first carriage system be guided solely on the first machine bed, and the second carriage system be guided solely on the second machine bed.

Abstract: A steady for holding rod-shaped components 40 of circular cross-section, with three holding-members in a common plane, one holding-member 16 being linearly movable and the other two being pivoted twin arm-levers 12, 14 and arranged to be operated as the holding member 16 is moved linearly, the distances of the members 12, 14 16 from the component center being maintained substantially equal and the drive connection between the linearly movable holding member 16 and the pivoting holding members 12, 14 being through eccentrics 48, 50 automatically rotatable for pivoting the holding members 12, 14 by an adjuster means 52.

Abstract: The turret on a slide of a machine tool is indexible between a plurality of positions in a sequence which is selected by a program. The apparatus for effecting the indexing of turret has a control unit wherein a hydraulic motor can rotate an indexing shaft at different speeds which are determined by the reciprocable spool of a valve regulating the flow of hydraulic fluid from the motor. The spool can be biased against a cam on the indexing shaft by a spring and can be retracted by an electromagnet which is controlled by a decoding unit having several cams on a camshaft which is driven by the turret and several switches which are adjacent to the camshaft.

Abstract: At least two longitudinally spaced and axially adjustable anti-friction bearings are provided on a support and each of these has an inner and an outer race. A spindle is rotatably journalled in these bearings and has one end adjacent one of the bearings. The spindle is subject to the action of axial forces acting upon one end in direction toward another end of the spindle which is adjacent the other bearing. A pressure-exerting arrangement adjacent the other end serves to exert upon the other bearing a counter force acting in direction towards the one end of the spindle and tending to shift the spindle counter to the axial forces, and a transmitting arrangement transmits the counter force to the outer race of the one bearing to adjust the same axially relative to the spindle in accordance with the shifting of the latter.