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Originally Posted by sanddrag
I've never heard of a CNC mill having a battery backup. Can you describe this a little more. Is it just for memory to save the programs that are loaded in it?
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Something that is initially mistaken for a transformer cannot possibly be a backup battery for a CNC. The only thing my shop's CNC needs is a small 9V battery to keep the programs loaded. A transformer would be really big. I think it is worth your money to have a professional electrician or mill repairman take a look at it. You dont want to bust your controller or anything, running it on the wrong power. It would cost a LOT more to get a broken stepper motor fixed than just to have a repairman look at it.