The production workshop generally uses the universal measuring instrument and gauge to measure the shaft diameter. Generally speaking, the shaft diameter measurement methods are as follows:
    1Gauge method:
    Using the gauge to test the shaft diameter, can not get the specific value, only to test the shaft diameter size qualified or not. The advantages are high precision and high inspection efficiency, and it is widely used in batch production.
    2, steel rule method:
    Measure directly with a steel ruler, or use a caliper to compare the size of the workpiece with a steel ruler.
    3, caliper method:
    Direct measuring of shaft diameter with vernier caliper, micrometer, lever micrometer, etc.
    4, micrometer method:
    Compare and measure with a variety of micrometers, micrometers and measuring blocks, commonly used micrometers (meters) are dial meter, dial meter, torsion spring comparator, inductance comparator, etc.
    5, instrument measurement method:
    The shaft diameter can be accurately measured by optical meter, length meter, tool microscope, etc. In the tool microscope, it is divided into image method, axial cutting method, interference method, sensitive lever method and so on. Measurement on optical meters, length gauges and other instruments can be divided into absolute measurement and relative measurement.
    6, gas meter method:
    By matching with various pneumatic measuring heads or pneumatic measuring devices, the pneumatic momentum meter can accurately measure the size or shape and position parameters of the measured parts by means of comparative measurement. The pneumatic measurement method is based on compressed air as a medium, using the characteristics of the flow or pressure of air in the pipeline with the geometric size and shape of the pipeline to convert the size or displacement into the change of flow or pressure, so as to achieve measurement.

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