A machine tool includes a first support disk and a first working disk. The first working disk defines a clamping surface and is fastened to the first support disk. A counter bearing element is positioned relative to the first working disk such that a working gap is formed between the first working disk and the counter bearing element and is dimensioned to accept a flat workpiece. A first clamping arrangement clamps the clamping surface of the first working disk to the first support disk such that the clamping surface faces away from the working gap. At least one decoupling element is positioned to at least one decoupling element configured to reduce friction between the first support disk and the first working disk.

A machine tool includes a first support disk and a first working disk. The first working disk defines a clamping surface and is fastened to the first support disk. A counter bearing element is positioned relative to the first working disk such that a working gap is formed between the first working disk and the counter bearing element and is dimensioned to accept a flat workpiece. A first clamping arrangement clamps the clamping surface of the first working disk to the first support disk such that the clamping surface faces away from the working gap. At least one decoupling element is positioned to at least one decoupling element configured to reduce friction between the first support disk and the first working disk.

Methods and machine tools for grinding discs. The machine tool comprises two grinding units with respective grinding spindles on which grinding wheels are arranged and a disc unit that comprises a disc spindle on which the disc to be grinded is arranged. The rotation axes of the grinding spindles are perpendicular to the disc spindle rotation axis. The grinding wheels comprise respective grinding surfaces which are perpendicular to the rotation axis of the disc spindle. The grinding surfaces have a width that is equal or greater than the width of the main surfaces of the disc. The two grinding units are configured to simultaneously move relative to the disc unit in an axis that is parallel to the rotation axis of the disc spindle and in opposite directions such that, in use, the grinding surfaces simultaneously contact opposite surfaces of the disc to grind them down.

Methods and machine tools for grinding discs. The machine tool comprises two grinding units with respective grinding spindles on which grinding wheels are arranged and a disc unit that comprises a disc spindle on which the disc to be grinded is arranged. The rotation axes of the grinding spindles are perpendicular to the disc spindle rotation axis. The grinding wheels comprise respective grinding surfaces which are perpendicular to the rotation axis of the disc spindle. The grinding surfaces have a width that is equal or greater than the width of the main surfaces of the disc. The two grinding units are configured to simultaneously move relative to the disc unit in an axis that is parallel to the rotation axis of the disc spindle and in opposite directions such that, in use, the grinding surfaces simultaneously contact opposite surfaces of the disc to grind them down.