Abstract: A grinding wheel which is mounted on the tool spindle of a grinding machine is detached from the tool spindle and is transferred onto a second spindle while the two spindles rotate. Reattachment of the grinding wheel to the tool spindle also takes place while the two spindles rotate. This saves time and reduces the wear upon the bearings and upon the brakes for the tool spindle. If a grinding wheel on the tool spindle is to be replaced with a different or fresh grinding wheel, the machine uses two additional spindles one of which serves to accept a grinding wheel from the tool spindle and the other of which delivers a different or fresh grinding wheel to the tool spindle.

Abstract: A wheelhead for use in grinding and like machines has a spindle which is rotatably mounted in a bearing and supports at least two grinding wheels one of which is attached to the spindle for treatment of two or more successive workpieces, particularly for finish grinding camshafts, cylinders, rolls and like objects. Another grinding wheel is separably coupled to the spindle so that it can be detached upon completed preliminary treatment of each of a series of successive workpieces. The separable grinding wheel is outwardly adjacent the one grinding wheel and is coupled to the spindle by manually operable means or by means which facilitates automatic mounting of such wheel on and automatic detachment of such wheel from the spindle by a wheel changer. The wheelhead can be used with advantage in universal or special external cylindrical grinding machines.

Abstract: A cam grinding machine wherein the slide which supports the grinding wheel need not support the motor which rotates the grinding wheel so that the inertia of the slide is low and the slide can be reciprocated toward and away from the rotating workpiece at a high frequency, without risking the development of sympathetic vibrations, in order to account for changes in the angular position of the workpiece and, if necessary, also for wear upon and for dressing of the grinding wheel. The motor for the grinding wheel is mounted on a carriage which supports the slide or is mounted on the bed of the grinding machine next to the slide for reciprocatory movement toward and away from the workpiece.

Abstract: In a grinding machine wherein a first carriage for the grinding wheel is movable at right angles to the axis of the grinding wheel toward and away from a second carriage which supports a dressing tool as well as the reciprocable or pivotable sensor of a distance measuring instrument and is movable in parallelism with the aforementioned axis, the grinding wheel is dressed by the dressing tool while the second carriage moves relative to the first carriage and vice versa. The distance between the periphery of the freshly dressed grinding wheel and the dressing tool is memorized in response to a signal which denotes the position of the sensor while the latter contacts the dressed portion of the grinding wheel, and the thus stored signal is used for proper positioning of the grinding wheel relative to the dressing tool preparatory to the next dressing operation.

Abstract: The grinding wheel is first dressed by a dressing tool and is thereupon sharpened or finished by particulate material which is introduced into a gap between its working surface and a pressure applying roll. The latter is thereupon ground by the grinding wheel. The controls of the grinding machine are used to feed the grinding wheel toward the dressing tool and the roll to different extents in order to compensate for the fact or possibility that the wear upon the roll during finishing is or can be more pronounced than the wear upon the dressing tool during dressing of the grinding wheel. This also ensures that the width of the gap can be maintained at a given value during each of several successive finishing operations.