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普通车床在大修时,床身导轨经过导轨磨床的磨削,及床鞍、拖板与床身导轨配研、铲刮后,必然引起溜板箱上开合螺母中心线和开关轴孔中心线对原三杆中心线偏移,以及使溜板箱上的纵行齿轮与床身齿条不能正确啮合。所以,在车床大修中必须要修复以下几项:(1)使溜板箱纵行齿轮与床身齿条正确啮合;(2)使横行丝杠传动齿轮与溜板箱齿轮正确啮合;(3)使走刀箱和后支架的丝杠、光杆中心线与溜板箱开合螺母中心线、光杆孔中心线保持同心。然而,应该根据溜板箱的实际位移大小,相应采取不同的修复方法:
Ordinary lathe in the overhaul, the bed guide rail grinder after grinding, and bed saddle, carriage and bed guide research, after scraping, will inevitably lead to the opening and closing of the slide box nut centerline and switch shaft hole centerline Offset to the original three-bar centerline, and the longitudinal gear on the carriage and the bed rack and pinion can not be properly meshed. Therefore, in the lathe overhaul must be repaired the following: (1) the vertical row of gear box and bed racks meshed correctly; (2) the screw drive gear and the correct gear box; (3 ) Make the feed box and back bracket screw rod, polished rod center line and slide box nut open and close the center line, polished rod hole center line to maintain concentric. However, depending on the actual displacement of the siding box, a corresponding repair method should be taken accordingly: