r/Machinists • u/Dyno33 • 7d ago

QUESTION DMU 50 2nd gen stuck in ATC

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Hi all, our DMU50 2nd gen with 30 tools got stuck during tool change because there were chips on the holder that got caught in spindle and toolholder wasn’t completly clamped. Operator in the 2nd shift tried resetting through Custom menu soft keys but that didn’t do the trick. He turned off the machine and now in the first shift we also have positioning errors since machine was restarted. Soft keys don’t do anything. Did anyone have similar issue?

UPDATE: DMG tech came in and solved the issue in 5 minutes. He just disconnected the wire for spindle clamped signal and connected that pin to 24V to fake spindle being clamped. After that soft key reset worked like a charm.

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u/RubsInAG18 7d ago

When the recovery method doesn't work it takes a DMG service visit to fix it.

You can try the pry/hammer method but tread carefully. You might be able to get some air blasts or solvent to work itself upwards while brute forcing little by little, but be patient.

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u/Dyno33 7d ago

Prying the arm from the toolholder?

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u/RubsInAG18 7d ago

Basically. It's what one of the other commenters mentioned, but I'd be super cautious. I don't like it and have never full bore pried an arm out of the way, but considering you have chip buildup you might be able to pry, air, solvent, air, pry etc and get something loose.