Apparatus for machining a number of workpieces with one tool

In apparatus for machining face-type serrations in the planar end faces of a plurality of ring-shaped workpieces, comprising a single tool and power means for driving said tool wherein the improvement comprises that said tool is a grinding wheel having an axis of rotation, a plurality of workpiece holders, each of said holders arranged to hold at least a separate workpiece, means movably mounting said holders for moving said holders at the same time so that each of the workpieces can be moved at the same time in the direction toward and transversely of the axis of rotation of said grinding wheel whereby each of the workpieces moves into engagement with said grinding wheel, said holders are disposed in positions spaced apart around said grinding wheel, said means movably mounting said holders is operable to move said holders stepwise each in a separate plane parallel to the axis of rotation of said grinding wheel, means for mounting said grinding wheel for a feed movement and for moving said grinding wheel through said feed movement with the feed movement being a movement in addition to the machining movement of said grinding tool, said grinding wheel is circular and is rotationally driven for the machining movement, and means supporting said holders for adjusting the grinding angle between the planar end faces of the ring-shaped workpieces to be machined and said grinding wheel.