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When milling the two sides of the workpiece (Fig. 1), we changed the single piece to two-piece milling. It is a typical part that requires all the six points in the fixture, and has a more complex floating positioning. Therefore, the correct selection of the two parts positioning clamping method is the key to the fixture design. The workpiece is changed from a single piece horizontal type to a double tube relative vertical type, the bottom surface B reference is a first positioning, the window surface C reference is a second positioning, and the inner surface H dimension is a third positioning. The fixture uses a linked floating positioning clamping mechanism (Figure 2).