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Measurement and calculation of keyway symmetry error
Factory keyway symmetry error is commonly measured by the 180° reverse method recommended in GB1958-80. In this method, the V-shaped block is used to simulate the reference axis, and the center plane of the measuring block or the positioning block represents the actual center plane of the keyway, and the indicator table is used to measure 180° in reverse. This method is simple to measure and easy to use in general factories. However, in practical applications, the measurement error is generally reflected, and even the non-conforming product is misjudged as a good product. This paper further discusses the existing problems and the improvement of the calculation method.