Precision parts processing is mainly the processing of some parts with very high precision. The precision of precision parts machining will directly affect the measurement parameters. So what are the measurement methods of precision parts processing accuracy?

    Precision parts machining can be divided into absolute measurement and relative measurement according to whether the reading value of the measuring instrument directly represents the value of the measured size.
    Absolute measurement:The reading value directly represents the size of the measured dimension, as measured with a vernier caliper.
    Relative measurement:The reading value represents only the deviation of the measured dimension from the standard quantity. If the diameter of the shaft is measured with a comparator, the zero position of the instrument should be adjusted with the amount of the block before the measurement is performed. The measured value is the difference between the diameter of the side shaft and the size of the measuring block, and is the relative measured value. Generally speaking, the relative measurement accuracy is high, but the measurement is more troublesome.
    Precision parts machining is divided into contact measurement and non-contact measurement according to whether the measured surface is in contact with the measuring head of the measuring instrument.
    Contact measurement:The measuring head is in contact with the contact surface and has an accurate measuring force. Like measuring parts with a micrometer.
    Non-contact measurement:The measuring head is not in contact with the surface of the measured part, and the non-contact measurement can avoid the influence of the measuring force on the measurement result. Such as using projection method, light wave interference method and so on.
    Precision parts processing can be divided into direct measurement and indirect measurement according to whether the measurement parameters are directly measured.
    Direct measurement:Directly measure the measured parameters and get the measured dimensions. For example, measurements are made using calipers and comparators.
    Indirect measurement:Measure the geometric parameters related to the measured dimensions, and calculate the measured dimensions.
    Obviously, direct measurement is more intuitive for parts processing, while indirect measurement is more troublesome. In general, when the measurement size or direct measurement can not meet the accuracy requirements, indirect measurement has to be used.
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