When machining precision parts, roundness measurement method and two-point three-point method can be used for detection. The circular instrument law is to place the measured part on the workbench of the roundness instrument, align the rotating centerline, and make the roundness instrument probe contact with the inner hole of the workpiece for rotation. Based on sensor, amplifier, filter and measurement power circuit, accurate measurement results are finally displayed. If the output is a specific contour map, the inscribed circle template can be used, and the difference between the radii of the two tolerance circles of the same boat can be taken as the roundness error of a section. The instrument is suitable for parts with high measurement accuracy requirements.
If the measured contour is an odd edge circle, the roundness error cannot be measured with the two-point method. At this time, the three-point method can be used for accurate measurement. Support the workpiece of the product to be tested with a V-shaped support, and measure the large error caused by one rotation of the workpiece with an indicator, which is taken as the roundness error of the section. Common V intersection angle α 60 degrees, 72 degrees, 90 degrees, 108 degrees and 120 degrees respectively. The three-point method can also be used for high-precision and accurate measurement in precision parts processing.
The above description is about the inspection methods for precision parts processing. I hope it will be helpful to you after reading
