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Okay so maybe it isn't so much screeching as an intermittent background noise like metal on metal. Machine is a 1996 Bridgeport VMC 600/22 and has been a great machine since we got it last year, milling lots of aluminium. However last week it began making the noise every 20 or 30 seconds for a couple of seconds at a time. It's loudest at 6,000rpm. No other noise, rumble or vibrations. Any suggestions?
It might be time for a spindle rebuild. Sounds like the bearings are going out.
That's what we thought. How long would it typically take before it becomes unusable? We have a few jobs to go out so ideally these would be finished before having the spindle taken out, although we'd get the engineer to confirm prior to removal.Quote:
Originally Posted by awerby
Nobody can really answer that question, all based on luck really. Compromised bearing(s) aren't necessarily something you can call usable at the first place, if this is confirmed to be the problem, mind you.Quote:
Originally Posted by Katanadan
I would monitor both the spindle temperature ramping curve and the operation temp closely. If really you need to process those parts...
Yeah. Somewhere between three milliseconds and thirty years.Quote:
Nobody can really answer that question, all based on luck really.
If it's the bearings, I'd expect it to take a toll on tool life, cut accuracy, and surface finish also.
:)
Certainly noticing a bit of chatter but that could be our work holding. I'm hoping someone near to us will be able to come out and diagnose the issue and rebuild the spindle if that's what is required. Would bearings not make a continuous sound if they were on their way out? Is it normal for a sound to fade in and out randomly when bearings are the suspect? I wondered if it could be related to the motor.Quote:
Originally Posted by __Britt