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Carrying for the "iron" on CNC machines is identical to manual machines. (keep oil on the ways and chips off) CNC machines generally have way covers with wipers at the ends. Maintenance to these wipers and covers will keep chips from building up in places where they may damage wires, switches, flexible cable ways and the ways themselves.
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If way covers become worn, warped or dented, they are allowing chips in where the shouldn't be. I own several old CNC machines. One was built in 1985. The iron is still in pretty good shape, she is capable of holding turn diameters of .0005 easily. However, the electronics are finicky. They are sensitive to temperature. I have to keep an extra fan on the power supply. Occasionally I need to replace a cable. They are repeatedly flexed and exposed to coolant. Most coolants are harsh on plastics and rubber. Choose your medicine, either run new machines and trade them in before they become trouble. Or, get to know a good technician. I do as much repairing myself, but there are times I can't figure it out and need to hire a tech. Usually at about $150/hour plus travel expenses. Fanuc has outstanding support, as does most major manufacturers. I've spent hours on the phone with Fanuc, Mori Seiki hotline, Ellison Technologies, and Milltronics. I have the good fortune of having both manual and CNC machines at my disposal. Denis
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