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Fanuc spindle drive help

Quick update for anyone that has the same problem in the future. We have spent the last couple weeks diagnosing in between part runs. Tennessee Industrial Electronics has been very helpful as suggested. My owner purchased both a megohmeter and an oscilloscope. Our spindle motor megged fine...
- Mopar73
- Post #17
- Jul 15, 2022
- Forum: CNC Machining
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Fanuc spindle drive help

Related to the issues I am experiencing with this spindle drive, some of the checks the manual want you to do require an oscilloscope which we also do not have. I have been looking on ebay and amazon and notice that there are a number of very reasonably priced digital versions available. I...
- Mopar73
- Post #15
- Jul 2, 2022
- Forum: CNC Machining
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Fanuc spindle drive help

Thanks, I'm actually corresponding with one of their techs as we speak as we got their contact info from this forum. I was expecting a call-back and didn't realize that they had sent me an e-mail 2 days before. No internet access at work.
- Mopar73
- Post #12
- Jul 1, 2022
- Forum: CNC Machining
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Fanuc spindle drive help

Thanks, yes it does have a small toothed belt that goes to an encoder. All I can say is duh. I guess it wouldn't make sense to rely on v-belts for timing of threads. I'll try to get them to spring for a set of belts before I go much further.
- Mopar73
- Post #10
- Jul 1, 2022
- Forum: CNC Machining
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Fanuc spindle drive help

Even 4k is more than my boss wants to put into this old girl at this point. I already told him, if that's the case, that he needs to start shopping for a newer lathe. I don't know how much longer this one is going to function in "limp mode."
- Mopar73
- Post #8
- Jun 30, 2022
- Forum: CNC Machining
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Fanuc spindle drive help

Actually, I know this machine has 6 or 7 drive belts and they are a greasy slimy mess and they do slip occasionally when starting spindle in high range. I know those last two sentences make me sound like a moron but getting my employer to fix something that is still remotely functional is very...
- Mopar73
- Post #7
- Jun 30, 2022
- Forum: CNC Machining
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Fanuc spindle drive help

Thanks, those were the components that I had my eye on. I assume what I would be looking for is that at least some of them have failed open, therefore the rest of the drive functions normally? Would I also want to check the 3 capacitors?
- Mopar73
- Post #3
- Jun 30, 2022
- Forum: CNC Machining
M
Fanuc spindle drive help

New member here. I will try to include any info that I think relevant in this initial post. My employer has a 1989 Wasino lathe with a Fanuc A068-6044-H742 AC spindle servo unit. The spindle braking has not worked properly for several years and has now regressed to the point that I have to...
- Mopar73
- Thread
- Jun 30, 2022
- Replies: 17
- Forum: CNC Machining