Small Counter Bore Diameter Automatic Measurement System

Deep hole diameter measurement questions are difficult at home and abroad, the current measurement method has the disadvantages of slow measuring speed and low precision. As the aperture decreasing, the measurement would be more difficult and the accuracy would be reduced. According to the above conditions, the noncontact measurement method based on the capacitance sensor is given out. The method can effectively improve the efficiency and accuracy of measurement. CCD combines with the 2-D micro-adjustment completes the function of precise positioning. Modular circuits make the signal integrity and accurate. LABVIEW software completes the function of controlling the system automatically, data acquisition and error correction. The experiments show that the scope of the whole system can be from Φ2.4mm to Φ7mm, the maximum resolution can be up to 0.5um, the highest precision can be up to 5um and linearity can be achieved 0.6018%. So the system can achieve nanometer measurement requirements.