Abstract: A method of machining outer surface of bodies of revolution by way of cutting, wherein a blank and a cutting tool are rotated about their axes, arranged out of line in mutually perpendicular planes, and are moved relative to each other at the beginning of a pass in the direction perpendicular to the blank surface being machined for cutting-in through the cutting depth, while the length of the cutting edge of the cutting tool is selected such that it spans the width of the blank cutting surface and, in the course of the cutting tool rotation, successively passes the blank cutting surface over the entire length thereof.The cutting machine for accomplishing the above process, has bed stocks which are mounted for positioning and rotating the blank being machined, and a rest arranged in guides provided in the bed.

Abstract: The present machine tool for crankshafts and the like is constructed to support the crankshaft directly adjacent to the point where the crankshaft is subjected to a machining operation. For this purpose both machining units are provided with an additional workpiece supporting device. At least one, preferably both of the additional workpiece supporting devices are axially displaceable into a rest position over or above a member cantilevered from the tool drum.

Abstract: A cutting apparatus with a vertical drive mechanism for in place machining f a valve seat which may include an annular turntable adapted to be rotatably mounted on the valve above the valve seat. A feed shaft is mounted through the turntable so as to be rotatable therewith, and a bottom of the feed shaft is adapted to receive a cutter for machining the valve seat. The vertical drive mechanism is mounted on the feed shaft and includes a nut threaded in the feed shaft and a gear combination. The gear combination may include a first portion which is fixedly connected to the nut, a second portion which operatively engages the first gear portion, and a third portion which operatively engages the second gear portion, the third gear portion being mounted for rotatable slidable friction engagement about the nut.

Abstract: Known machines for milling a crankshaft comprise a longitudinal carriage movable in a first direction, a tool carriage movable on the longitudinal carriage for reciprocation relative thereto in a direction transverse to the first direction, a cutter head mounted on the tool carriage for rotation and having a cutting tool with inwardly directed cutting edge extending along a cutting circle and a chuck supporting a workpiece for rotation about the same axis as the cutter head and surrounded by the cutting circle.