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First, the original method is because the rigidity of the slender shaft is low, and it is easy to be deformed during the machining process, so the center frame and the tool holder are required. When adjusting the center frame, the traditional method is to adjust the three pivot points of the center frame by the operator's experience. As shown in Figure 1, this adjustment method has the following shortcomings. (1) Operators are required to have a higher level of skill and experience in machining slender shafts. (2) Due to the manufacturing error of the screw pair of the three fulcrums on the center frame, it is difficult to make the three fulcrums force evenly with the hand feeling. (3) It is often necessary to make multiple adjustments and waste time.