Precision parts processing mainly involves processing some very high-precision parts. These parts are used in different application industries. The machining accuracy of three precision parts will directly affect the measurement parameters. The measurement accuracy can be used according to different situations. So let's talk about the methods to operate as follows:

Precision parts processing can be divided into absolute measurement and relative measurement based on whether the reading value of the measuring instrument directly represents the value of the measured dimension.

Absolute measurement: The reading value directly represents the size of the measured dimension, such as using a vernier caliper to measure.

Relative measurement: The reading value only indicates the deviation of the measured dimension from the standard quantity. If using a comparator to measure the diameter of a shaft, use a gauge block to adjust the zero position of the instrument before making the measurement. The measured value is the difference between the diameter of the side shaft and the size of the gauge block, which is a relative measured value. Generally speaking, the relative measurement accuracy is relatively high, but the measurement is relatively troublesome.

Precision parts processing can be divided into contact measurement and non-contact measurement based on 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 contacted surface and has an accurate measuring force. For example, use a micrometer to measure parts.

Non contact measurement: The measuring head does not contact the surface of the measured piece, and non contact measurement can avoid the impact of measuring force on the measurement results. Such as using projection method, light wave interference method, etc.

Precision parts processing can be divided into direct measurement and indirect measurement based on whether the measurement parameters are directly measured.

Direct measurement: directly measure the measured parameters to obtain the measured dimension. For example, use a caliper and comparator to make measurements.

Indirect measurement: Measure geometric parameters related to the measured dimension, and calculate the measured dimension.

Obviously, direct measurement for part processing is more intuitive, while indirect measurement is more cumbersome. Generally, when measuring dimensions or direct measurements cannot meet the accuracy requirements, indirect measurements have to be used.