Machine frame for a machine tool with a lower part (1) and a machine bed (2) arranged in the lower part (1), characterized in that the lower part (1) and the machine bed (2) are made as boxes (6, 10) reinforced with ribs (5, 9), respectively, and are firmly connected to each other by means of alignment units (3) and interlocking fixing elements (4) to form a unit suitable for being aligned with a high total stiffness and good damping properties.
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