CNC ????? ??????? ?? ??? ?? ?????? ???? ???? ??? ?????? ?? ???? ????? ???? ?? ?? ??????? ????? ?? ????? ?? ????? ??? ?????? ?? ??? ???? ??. ???? ????? CNC ????? ??????? ?? ???? ?????? ?? ??? ?????? ????? ??? ?? ??? ????????????? ?? ????? ????? ??? ??? ????? ?????? ?? ?????? (ISO) ?? ????? ???? ??? ????? ?????: 1. ????? ??? ????? ?? ?????? ?? ?????? · ???? ?? ????? · ???? ?? ????? ????: ????? ?????? ?????? ???? ?? ?????? ????? ??? ?? ????? ????? ?? ???? · ???? ????? ??? ??????: ?????? ?? ????? ?????? ?? ????? ???? ????? ??? ?????? ??? ?? ???? ?????? ?? ???? ????? ???? ?????? ??? ???? ?????? ????? ?? ???? ?????? ???? ????? ?? ??? ????? ????? ?????? ?? ???? ?????? ?? ??? ?????? 2? ?????? ????? ??? ????? - ??? ??????????: ??? ????????? ?? ????? ??? ????? ?????? ?? ????? ?? ?????? ??? ?????? ?? ????????? ??? ???? ?? ??? ????????? ?? ????? ??????? ???? ?????. ??? ?????????? ??? ???? ???? ??? ???? ???? ??? ?????? ?? ?????? ?? ?? ????? ?? ?????? ?? ????? ??? ????? ????? ?? ???? ?????? ?? ???? ??? ?? ?? ????? ?? ?? ?????? ???? ?????? ?? ???? ??? ????????? ????? ??? ?????? ????? ??????????: CNC ?????? ???? ??? ????????? ????? ?? ???? ??????? ?? ???? ??? ??? ?????? ????? ?????????? ?? ???? ?????? ?????? ?? ??? ???? ??????????? ???? However, it should be noted that the accuracy of the measuring instrument is 1-2 levels higher than that of the tested instrument. 3? ???? ???? ?? ????? ??? ???: ?????? ?? ??? ?????? ????: ??? ????? ?? ????? ?? ??? ?????? ?? ?????? ???? ??? ?? ????? ?????? ?? ????. ?? ?????? ?? ?????? ???? ??? ??? ??? ??? ??? ??? ??? ??? ?? ??? ??? ????? ????? ?? ?????? ?? ???????? ?? ??? ?? ???? ??. ???????? ?????? ?????? ????: ?? ?????? ?????? ?????? ??? ??? ??? ???? ?????? ?????? ??????? ???? ?? ??? ??? ?????? ?? ??? ?? ??? ?? ???? ?????? ???? (?? ??? ?????? ?????? ?? ?????? ?? ?????? ?? ?????? ?? ????? ???? ???? ???? ?? ???? ????: ??? ?????? ?? ?????? (???? ??? ???? ??????? ?? ????) ?????? ???? ????? ?? ??? ?? ????? ?? ??? ???? ???? ??? ?? ??? ?????? ???? ?? ?? ??? ???? ???? ?? ???? ??? ???? ??? ??? ?? ???? ???? ????: ??? ?? ???? ??? ???? ?? ??? ??? ??? ????? ???? ?? ?????? ????? ?? ???? ??? ????? ?? ?? ???? ???? ????? ?????? ????? ?? ???? ?? ????? ??? Reverse error detection: The reverse error (loss of momentum) of linear motion reflects the comprehensive influence of errors such as the reverse dead zone of the driving components on the coordinate axis feed transmission chain, the reverse clearance of each mechanical motion transmission pair, and elastic deformation. ???? ???? ?? ????? ?? ?? ?? ??? ????? ??? ?? ????? ???? ?? ??? ???? ???? ???? ??? ?? ?????? ???? ?? ??? ?? ???? ???? ?? ??? ?? ??????? ????. ???? ??? ????? ???? ?? ?????? ?? ????? ??? ????? ??? ?? ??? ??? ????? ????? ????? ???? ?? ??? ???? ?? ??? ??? ????? ????? ???? ????. ??? ????? ?? ????? ??? ??? ?? ?????? ?? ??? ?????? ??? ??? ?? ?????? ???? ??? ?? ?????? ?? ????? ?????? ?? ???? ???? ?? reverse error ?? ???? ????? CNC ????? ??????? ?? ???????? ?? ???? ???? ??: CNC ????? ??????? ?? ??? ??? ?????? ?????? ?? 30 ?? ?????? ?? ???? ???? ?????. ?? ????? ????? ?????? ?? ???? ??? ???? ?????? ?? ??? ?? ??? (???? 7 ???) ???? ???? ????? ????? ?????? ??? ????? ?????? ?? ?????? ????? ?? ???? ????? ??? ????? ????????? ??? ???? ??? ???? ?????? ?? ??????? ???? (???? GB10931-89) ?? ?? ????? ????? ????? ?????? ???? ??? ????????? ??? 4? ???? · ????? ???? ?? ?????: ?????? ?? ????? ?? ???? 1-2 ??? ?? ????? ?? ?? ?????? ?? ????? ?? ???? ???? ?? ??? ????? ??? ?????: measurement process ???, attention should be paid to observe and recording factors that can affect the measurement results, such as temperature fluctuations, machine tool vibrations, etc., and considering the impact of these factors on positioning accuracy during data analysis· ????? ???????? ??? ???????: ?????? ?? ????? ???????? ??? ???? ????? ????? ?? ?? ?? ???? ??? ???? ?? ???? ??? ?????? ??? ???? ????? ?? ????? ????? ???? ??? ????? ???? ?? ??? ?? ?? ???? ??????? ??? ?????? ?? ???? ????? ???? ?? ??? ??? ????? ??.