The machine can produce 21 errors in the machining process
Usually according to function in all free movement direction, errors of the geometric parameters of equipment are divided into three position degrees, six, nine angle straightness error, and three vertical degrees in three axis, a total of 21 parameter error. Generally, those so-called 21 errors are referred to, when the equipment is in the process of operation, due to the unstable factors in the operation of the axes, each axis in six directions can produce six errors. Meanwhile, the angle relationship in the three axis also produce three error, in total 21 errors.
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