The pneumatic gauge is not only suitable for measuring high-precision parts, but also for measuring high-finish workpieces. The surface roughness of the workpiece will have a great impact on the flow of air, and the key to pneumatic measurement is the proportional relationship between the gap and the airflow, so the measurement accuracy is difficult to say. Generally common parts to be measured are grinders or precision lathes for their roughnessRagenerally0.8~1.7Around, if beyond this range, it will have a certain impact on the accuracy, if the accuracy is acceptable, it can also be measured using pneumatic, but if the roughnessRaGreater than3.2Then it can not meet the requirements of measurement accuracy.

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