As shown in the figure, it is a simple sliding sleeve type vertical measuring instrument. The main shaft 9 is a smooth cylindrical shaft made of T10 and Cr15 materials with a straightness tolerance of 0.002 mm. The lower end is a Mohs 4~? cone is matched with the base 11, and is tensioned from the bottom with a grub screw to keep the main shaft in a vertical state. The sliding sleeve 2 is mounted on the main shaft 9, and the two are matched
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