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贵刊今年第3期曾刊载《键槽对称度公差值及其测量》一文,笔者对该文讨论的问题不敢完全苟同,这里,也谈点一管之见,仅供探讨。 键槽对称度误差的检测,GB1958—80《形状和位置公差检测规定》中的对称度误差检测方案(3—1)规定: 基准轴线由V形块模拟,被测中心平面由定位块模拟。分两步测量。 ①截面测量:调整被测件使定位块沿径向与平板平行,测量定位块至平板的距离,更将被测件旋转180°后重
Your issue No. 3 of this year has been published, “Keyway symmetry tolerance values and measurements,” one article, I do not fully agree with the issues discussed in this article, but also talk about a tube of opinion, for discussion purposes only. Keyway Symmetry Error Detection, GB 1958-80 “Shape and Position Tolerance Provisions” in the symmetry error detection scheme (3-1) provides: the reference axis by the V-shaped block simulation, the measured center plane by the positioning block simulation. Measure in two steps. ① cross-section measurement: Adjust the test piece so that the positioning block is parallel to the flat plate in the radial direction, and measure the distance between the positioning block and the flat plate. After rotating the test piece by 180 °