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My son gave me some additional information.
He said that HAAS has a timed correction function in our machine. However, he does not use it, but rather prefers manual correction. I have not looked into this so I do not know what the HAAS algorithm is.
His second point was that during a 30 min break he has seen the machine grow in the same direction it was moving while running. This probably means it is heat from the spindle and that there is a long time constant.
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