The floor milling and boring machine is a super large heavy machine tool, which is mostly used for gravity cutting. When the machine ram is extended or the attachment is added, the center of gravity of the headstock is moved forward due to the action of gravity, and the ram is lowered. The only change amount is that the amount of ram extension is different, and the degree of bowing is different. If this situation is not improved, it will seriously affect the machining accuracy of the machine tool. In the floor milling and boring machine, in addition to the ram, the boring shaft itself
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