在第一篇文章中,对机床主轴由于制造和装配误差引起的各种运动下了定义,并简要地叙述了测量方法。在第二篇文章中,说明了轴承的几何精度及安装误差对主轴运转精度的影响。本篇介绍影响机床主轴运转精度的其它因素。工作条件加工精度,切削力和切削速度是三个主要的外工作条件,它们要求主轴件有相应的内部工作条件。即轴承间隙或予载荷,润滑及工作温度。轴承要求精确定位时,不管工作条件如何,在滚动体及滚道之间不允许存在间隙。但是在装配轴承时,经常需要保留一些初始间隙,间隙量根据其它因素确定。滚动摩擦 In the first article, the various motions of the machine tool spindle due to manufacturing and assembly errors were defined and the measurement method briefly described. In the second article, the influence of bearing geometry and mounting error on the spindle’s operating accuracy is illustrated. This article describes other factors that affect the accuracy of the spindle of a machine tool. Working conditions Machining accuracy, cutting force and cutting speed are the three main external working conditions, they require the spindle parts have the corresponding internal working conditions. Bearing clearance or preload, lubrication and operating temperature. When the bearings require precise positioning, no clearance is allowed between the rolling elements and raceways, regardless of the working conditions. However, in the assembly of bearings, often need to retain some of the initial gap, the amount of clearance determined by other factors. Scroll friction