在机械加工中,对批量少、规格多、精度要求高伪长度尺寸零件的加工,多数工厂由于没有精密设备,只能在普遍镗床或铣床上加工。但这些机床存在着刻线盘和走刀母丝杠的误差,所以对于孔距在100±0.01mm, 300±0.02 mm, 500±0.03 mm, 1000±0.05mm…等尺寸精度只能在平合上进行间接 In machining, the small batch, specifications, precision requirements of the length of the pseudo-length parts processing, most factories because there is no precision equipment, only universal boring machine or milling machine processing. However, these machines have the error of engraving plate and cutter bar, so the dimensional accuracy of 100 ± 0.01mm, 300 ± 0.02mm, 500 ± 0.03mm, 1000 ± 0.05mm, On the indirect