Grinding machine and method of operating such grinding machine

The present invention relates to a grinding machine comprising a first and a second grinding wheel separated by a gap and configured to contact a workpiece; a support blade positioned in the gap and having a contact surface having a work profile shaped to contact at one and only one point at a time the workpiece, and being further shaped to contact the workpiece with different working angles, in different respective working steps. Also, the present invention relates to a method for operating such grinding machine comprising a support blade configured to arrange the workpiece at a first working height with a first working angle in the first working step, and at a second working height with a second working angle, in the second step.