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（一）基本情况: 我厂微型轴承孔径测量历来采用塞规。由于生产的发展与质量要求尚不能满足需要,在中原量仪厂的协作下,试验成功了气动测量仪,改变了原来测量手段,提高了测量精度,减轻劳动强度,节约了测量工具的制造以及解决了过去塞规不能测量的几何形状（如椭圆度、锥度、鼓形等）的测量,为我厂测量工具创制了一条新道路,目前正在全面推广。
(A) of the basic situation: I plant miniature bearing aperture measurement has always been used plugs. Due to the development of production and quality requirements can not meet the needs of the Central Plains Instrument Factory in collaboration with the successful test pneumatic measuring instrument, changing the original measurement methods to improve the measurement accuracy, reduce labor intensity, saving the manufacture of measurement tools and Solve the geometry of the past can not measure the plug gauge (such as ovality, taper, drum, etc.) measurement, measurement tools for our plant created a new road, is currently fully rolled out.