Machine tool for grinding discs

A machine tool for grinding discs, comprising:

• a first grinding unit comprising a first grinding spindle comprising first and second grinding wheels arranged thereon and a first motor assembly to rotatably actuate the first grinding spindle;
• a second grinding unit comprising a second grinding spindle comprising first and second grinding wheels arranged thereon and a second motor assembly to rotatably actuate the second grinding spindle;
• a first disc unit comprising a first disc spindle on which a first disc to be grinded is to be arranged and a third motor assembly for rotatably actuating the first disc spindle;
• a second disc unit comprising a second disc spindle on which a second disc to be grinded is to be arranged and a fourth motor assembly for rotatably actuating the second disc spindle;
• wherein the first grinding wheel of the first grinding unit is located in correspondence with the first grinding wheel of the second grinding unit to simultaneously grind the first disc and the second grinding wheel of the first grinding unit is located in correspondence with the second grinding wheel of the second grinding unit to simultaneously grind the second disc;
• wherein the rotation axes of the first and second grinding spindles are perpendicular to a rotation axis of the first and second disc spindles;
• wherein the grinding wheels comprise respective grinding surfaces, said grinding surfaces being substantially perpendicular to the rotation axis of the first and second disc spindles and having a width (w1, w2) that is equal or greater than a width (w3) of the surface of the discs to be grinded, the width (w3) of the surface of the discs to be grinded being measured in a radial direction of the discs;
• and
• wherein the first grinding unit and the second grinding unit are configured to simultaneously move relative to the first and second disc units in an axis that is parallel to the rotation axis of the first and second disc spindles and in opposite directions such that, in use, the grinding surfaces of the grinding wheels are configured to simultaneously contact opposite surfaces of the discs along the entire width (ws) of the surfaces of the discs to be grinded.