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【简答题】
用三针测量法测量 Tr42 ╳ 6 的梯形螺纹丝杠,已知该螺纹中径的基本尺寸和极限偏差为 φ39 mm,上偏差-0.125,下偏差-0.480,求三针的最佳直径是多少?用该直径的三针测量的 M 值范围是多少?如果测量的工件实际外径是 φ39.85 mm,改为单针测量,则测量值 A 的范围是多少?
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皮皮学刷刷变学霸
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ancient Greek medicine
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At the post office.
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