Originally Posted by
mactec54
Should of looked more carefully it was another poster mountaindew that was posting 1100 machine
Hobby type machines yes they don't normally need a warm up, after they have been run, a simple warmup though can add life to the Bearings, as I said thermal expansion is happening to all machine spindles even your 440 it is going upwards instead of down, that is why you don't notice very much in your part Z depth change, been building spindles and Bearings for more than 20 years, it's all in the design as to where the expansion goes, and how accurate the Z axis positioning is, It's not always the spindle that causes Z depth to change as things heat up