Abstract: A machine tool head in which a rotary spindle is adapted to nutate by virtue of the spindle being mounted in a housing supported to rotate about a predetermined axis and by virtue of the housing being mounted in another housing adapted to rotate about an axis which is inclined relative to the first axis. A train of bevel gears connects the spindle to a non-nutating drive motor and maintains a rotary drive from the motor to the spindle in all positions of the spindle.

Abstract: An adjustable face milling cutter is carried on a turntable rotatable about a central axis that is coaxial with the cylindrical shell of the steam generator in which the tubesheet is located, to machine a circular path on the upper tubesheet surface. For complete circle-by-circle scanning of the tubesheet surface, the radius of the circular machined path is variable by virtue of mounting the milling cutter on the outer periphery of a circular mounting member turnable to different locked rotary positions about an off-center pivot axis on the turntable. The rotary support for the turntable is at its outer periphery, as provided by an encircling support ring which in turn is supported by a ball bearing assembly having an inner race secured to the turntable top and an outer race secured to the support ring top; teeth on the inner race being provided to accommodate a motor-operated drive gear.

Abstract: Each of two tools is used in a sequence of operations to machine respective cylindrical portions of a multiple-crank crankshaft and the crankweb side faces adjoining said cylindrical portion. To permit an optimum utilization of the two tools and to ensure a substantial shortening of the time required for the machining of a crankshaft, the infeeding direction and the orbital feed rate of each tool are controlled independently of the other tool and only in dependence on the requirements for the respective operation. The crankshaft is held in a fixed position until its machining has been completed. In a milling machine for carrying out the process, each tool consists of an internal milling cutter and means are provided for moving said cutters independently of each other along three coordinate axes.

Abstract: A crankshaft milling machine comprising a bed, a pair of rails fixedly secured to the bed, a spindle fixedly mounted on the bed, a chuck mounted for rotation on one end of the spindle, a first motor for imparting a rotation to the chuck, a tool guide slidably mounted on the rails, the tool guide being inverted U-shape in cross-section, a tool support movably accommodated within the tool guide, the tool support being reciprocally movable in a vertical plane, and a second motor for causing a reciprocal movement of the tool support. An internal tooth cutter is rotatably supported by the tool support and a third motor is installed for rotating the internal tooth cutter. A numerical control device is provided for controlling the relative movement of the chuck and the tool support in such a way that the rotation of the chuck is synchronized with the reciprocal movement of the tool support.

Abstract: An eccentric boring tool and method of forming a bore off center from the central axis of a workpiece are disclosed. The tool includes a tool holder nonrotatably supported relative to a workpiece and an outer housing supported for rotation with the workpiece and rotation relative to the tool holder. An eccentric supported within the housing mounts a bearing which in turn supports the tool holder. The eccentric rotates with the housing causing the longitudinal axis of the tool holder to orbit about the longitudinal axis of the workpiece. An end mill cutting tool is supported in the tool holder. A plurality of discs are supported in the forward end of the housing. The discs engage the workpiece, lock the housing to the workpiece and cause the housing to rotate at the same speed as the workpiece.

Abstract: A welding machine can form continuous welds of three hundred and sixty degrees on workpieces which are rotated through angles of less than three hundred and sixty degrees by moving the welding torch of that welding machine in one direction circumferentially of those workpieces while those workpieces are being rotated in the opposite direction.

Abstract: A spherically shaped combustion chamber is machined in the cylinder head of an internal combustion engine by revolving one or more cutting tools simultaneously about two axes; one axis being the central axis of the combustion chamber and the other axis being inclined thereto. The tools have a cutting point and a cutting edge extending from the cutting point. The tools are supported so that each cutting point passes through the axis of the combustion chamber, and, when each tool is located in its radially outermost position relative to the axis of the combustion chamber, the cutting edge of the tool cuts an annular surface around the periphery of the spherically shaped portion of the combustion chamber, which, at the bottom face of the cylinder head, corresponds in diameter to that of the cylinder bore.

Abstract: In a process of milling a multiple-throw crankshaft comprising mainshaft portions and crankpins in alternation, two outer crankpins of three axially consecutive crankpins are milled at the same time while the crankshaft is supported at its ends and at the mainshaft portions which connect said three crankpins.