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JB 2886-81《机床梯形螺纹丝杠、螺母精度》部标准是在原机床专业标准GC 101-60《梯形螺纹丝杠、螺母公差》的基础上修订的。主要对三个方面作了修订:丝杠精度等级增加一级──4级精度;增加了动态测量指标──螺旋线公差;全长累积允差的合理化。同时,对其它各项精度作些修订和
JB 2886-81 The standards for the machine tool trapezoidal thread screw and nut precision are revised on the basis of the original machine tool professional standard GC 101-60 “Trapezoidal thread screw and nut tolerance”. Mainly revised in three aspects: Increasing the level of screw accuracy level - Level 4 accuracy; Increasing the dynamic measurement indicators ─ ─ helical tolerance; the cumulative length of the cumulative allowance rationalization. At the same time, make some amendments to other precision