Machining parts size inspection principles:
    First, basic principles
    The acceptance method used shall only accept work within the specified dimensional acceptance limits. For workpieces with matching requirements, the dimensional inspection should comply with the Taylor principle. Or the action of the shaft is not allowed to exceed the maximum physical size.
    Two, the principle of minimum deformation
    In order to ensure the accuracy and reliability of the measurement results, the deformation caused by various factors should be minimized.
    Third, the principle of the shortest size chain

    In order to ensure a certain measurement accuracy, the link of the measurement chain should be reduced to the minimum, that is, the measurement chain should be the shortest (to reduce the accumulation of measurement errors).

    Fourth, the principle of closure
    In the measurement, if the closure condition can be met, the sum of its interval deviation is zero, that is, the closure principle.
    5. Principle of unification of benchmarks
    The measurement basis shall be consistent with the design basis and the process basis.
    6. Other provisions
    a,It should be considered with the measurement results of size and shape error to determine whether the workpiece is qualified.
    b,Generally, only one measurement result is used to judge whether qualified or not.
    c,When there is a dispute between the use of measuring instruments and the use of gauges, the use of conformityGB/T1957-1981The following gage arbitration specified in the Smooth Limit Gauge standard: The general gauge shall be equal to or close to the maximum physical size of the workpiece; The stopgauge shall be equal to or close to the minimum physical size of the workpiece.
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