Ive seen enough misinformation in this thread, it makes me almost sick....
First, I worked in a CNC shop this summer, so I actually have hands on experience working with these machines, it isn't just something I read somewhere.
Ok, about the dropping of the spindle when you lose power, after you turn the machine back on, you re-home the slides. So the spindle dropping would not be an issue. However the better machines I worked with didn't even need that. If there is any doubts at all it takes a full 3 seconds to zero the slides
Especially on a machine that small with a rapid that fast.
As for tolerances, I'm not saying that 2 microns is something that isn't achievable, but for a $100k machine ...no... I would expect to see the machine be able to go down to .0001" but that's it. As for actual working tolerances... unless your building something that is using multiple pressed pins for holding together 2 pieces, you wont even notice .005" difference. as for measuring down that fine... I would like to see equipment to measure down to 2 microns, for larger pieces... we had a small digital height gauge that went down to 5 decimal places, but that small, tip diameter becomes and issue.
oh and,
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Originally Posted by rees2001
I was just trying to let that one go but you nailed it right on the head. I wouldn't exactly call this machine "compact" though.
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Trust me, that is compact. Compare that to a horizontal machine, 11 pallate changer, 240 tool changer, 19.6x19.6" travel, 20,000 rpm spindle, up to 1000 ipm feed rate (feed, not rapid). Yes, that is a compact machine.
Oh one thing that I dont know for sure though, I thought the servo motors on the CNC used DC, not AC, and the power input was rectified, and then fed to the servo amps.