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Originally Posted by sanddrag
If you are worried about 2 microns why are you building FRC robots instead of high precision satellite instruments? Two microns is less than one ten-thousandth of an inch. How would you ever be able to see or measure the spindle dropping by this minuscule amount? Most common CNC milling machines can keep a tolerance of at most around 4 ten-thousandths if they are fairly new, high quality, and properly maintained and operated. So even if the spindle would drop 2 ten-thousandths, there is still nothing to be concerned about. If it were to drop 2 one-thousandths, then I'd look into the problem (well, actually have a service rep look into the problem) because that is a pretty good amount (thickness of a sheet of paper). So, did you mean thousandths instead of microns?
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I don't think that he cares about 0.002 mm in the slightest, however, it is quite understandable that the original industrial user might. (If, for instance, it was being used to make mounting hardware for a medical laser, those two microns might be of some value to the person who gets to put their eye underneath it.)
They, not the team, were the ones who had a battery backup system installed, after all.
By the way, that mill seems to be just right for a FIRST team; nice and compact, very versatile...if only we all had sponsors like yours, or $100 000 (USD) collecting dust.