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(1)单轴镗削头(几个镗削头安装在同一动力滑台上):被加工孔的坐标位置精度可达到±0.025mm;孔轴线在300mm长度上的平行度0.03mm。(2)多轴镗削头(即刚性主轴的多轴箱):被加工孔的坐标位置精度,在主轴悬伸短(250mm)、刚性好的情况下,可达到±0.05mm,一般为±0.07mm。孔轴线在300mm长度上的平行度0.10mm。(3)用一根镗杆镗削几层同心孔系时,孔的同轴度可以保证在0.015～0.02mm范围内。若分别由两根镗杆从工件两端加工时,孔的同轴度可以达到0.03～0.05mm。
(1) Single-axis boring head (several boring heads are mounted on the same power slide): the coordinate position of the hole to be machined can achieve ± 0.025mm; the parallelism of the hole axis on the length of 300mm is 0.03mm. (2) multi-axis boring head (rigid spindle multi-axis box): the coordinates of the machined hole position accuracy, the spindle over the short (250mm), good rigidity, up to ± 0.05mm, generally ± 0.07mm. The parallelism of the hole axis on the length of 300 mm is 0.10 mm. (3) When boring several layers of concentric holes with a boring bar, the concentricity of the holes can be guaranteed in the range of 0.015 ~ 0.02mm. If two boring bars are machined from both ends of the workpiece, the coaxiality of the holes can reach 0.03-0.05mm.