Testing methods for precision parts processing

When machining precision parts, roundness measurement method, two-point method, and three-point method can be used for inspection. The roundness method is to place the measured part on the workbench of the roundness meter, find the rotation centerline, and make the probe of the roundness meter come into contact with the inner hole of the workpiece and rotate. Based on sensors, amplifiers, filters, and measurement power circuits, accurate measurement results are ultimately displayed. If the output is a specific contour map, you can use the inscribed circle template to take the radius difference between two tolerance circles on the same ship as the roundness error of a section. This instrument is suitable for parts that require high measurement accuracy.

When machining precision parts, if the measured contour is an odd edge circle, the roundness error cannot be measured using the two point method, but can be accurately measured using the three point method. Use a V-shaped bracket to support the measured workpiece, and use a micrometer to measure the large error generated by the rotation of the product workpiece for one cycle, as the roundness error of the cross-section. Common V-shaped intersection angles α They are 60 degrees, 72 degrees, 90 degrees, 108 degrees, and 120 degrees, respectively. The three-point method can also be used for high-precision precision measurement in precision parts processing.