Grinding machine for grinding pregeared bevel gears

A grinding machine for grinding pregeared bevel gears, the grinding machine comprising a stationary machine bed, a workpiece carrier for a bevel gear, a motor driven spindle in said carrier and holding a bevel gear to be ground, a motor driven grinding head having a grinding spindle, a grinding wheel on said grinding spindle, a truing device connected to a rigid part of the machine and cooperating with said grinding wheel, said truing device being pivotable relative to said grinding wheel for changing an angle of engagement with said grinding wheel, said grinding wheel and the bevel gear being ground cooperating with one another to execute a hobbing motion to generate a shape of a tooth in a direction of a tooth depth, said grinding wheel defines a shape of the tooth in a longitudinal direction of the tooth and a cutting motion of said grinding wheel results in a metal removal from the pregeared bevel gear being ground, and an eccentricity of the grinding spindle to a center of the grinding machine results in a desired angle of the tooth an individual motor drive means for independent driving said truing device, and, wherein said grinding is adjustable by a motor in a radial direction to said bevel gear and also in a direction perpendicular to said radial direction over a limited distance.