The thread micrometer is one of the universal measuring instruments in the machining industry, and the proofing bar is one of the calibration tools to ensure the zero position of the thread hand. The proofreading rod is used as a standard part. The factory measuring room is generally measured on the tool microscope. In practice, the repeating precision error is large, the general error is 0.01~0.02mm, and the calibration error of the proofing rod L is not more than 0.005mm. The above error is caused by
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