Abstract: In order to avoid the undulation of tolerance and to reduce the time and cost of grinding, the machine and method carry out a continuous dressing of the abrasive rim by a lateral cutter-wheel. A bell grinding-wheel and its rim are moved axially in a slow movement just exceeding the amount of attrition of the grinding-wheel. Thus the abrasive rim is continuously redressed. The level of the uppermost generatrix of the diamond cutter-wheel above a table exactly determines the thickness of the ground workpiece. The cutter-wheel is rotated by a motor; a rolling effect may occur. This machine and method are suitable for very precise mass-production grinding of industrial workpieces.

Abstract: Two grinding-wheel spindles bearing grinding wheels are mounted on a table which undergoes an angular displacement for simultaneously grinding convergent internal and external conical surfaces of a workpiece, on the one hand, and for truing the grinding wheels by means of truing tools, on the other hand. The truing tools are so positioned that the grinding faces of the wheels are trued in a manner whereby the workpiece surfaces are then automatically ground with extreme precision and the exact desired diameter of the circular edge formed at the junction of the convergent surfaces is obtained.