Generally, the optimal bearing must be selected to<\/p>\n

suit the nature of the machine, the area within the<\/p>\n

machine, the spindle specification, bearing type,<\/p>\n

lubrication system and drive system of the intended<\/p>\n

machine through considerations of the design life, \u00a0precision, rigidity and critical speed of the bearing.<\/p>\n

Accuracies of rolling bearings, that is, dimensional accuracy and running accuracy of rolling bearings are defined by applicable ISO standards and JIS B 1514 standard. Usually, a high-precision bearing is JIS Class 5 or higher. In particular, the radial run-out, axial run-out and non- repetitive run-out of a main spindle bearing greatly affect the running accuracy of the main spindle and therefore have to be strictly controlled. With the recent super high-precision machine tools, the control of N.R.R.O. (Non-Repetitive Run-Out) has increasing importance, and the main spindle on a turning machine or machining center incorporates an N.R.R.O. accuracy controlled bearing.<\/p>\n","protected":false},"featured_media":5300,"template":"","meta":[],"yoast_head":"\n