High-speed, precision spindles need highly accurate lubrication. Systems operating at speed factors above 2 million nxdm - that's more than 30,000rpm on conventional tool spindles - require precisely matched quantities of lubricant in order to maintain optimal bearing operation. The frictional moment in the bearing needs to be as low as possible, while mixed friction needs to be avoided to prevent undue wear. There are several recognised ways of lubricating high speed machine tool spindles, including greased for life bearings and interval lubrication. The favoured method is a centralised lubrication system - though this is far from perfect because it often uses a comparative method of monitoring volumetric lubricant flow.
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