By the way, one subtle thing I noticed too that leads me to the bearings as a problem.
Normally when the spindle is off and the dust removal vacuum system is working, the spindle tends to spin by itself because of the vacuum action on the impeller I installed. This almost never happened yesterday. So, to sum up: I was able to free turn the spindle by hand at all times, but the vacuum was not always able to make it spin the impeller and if it did it wasn't nearly as fast as days before. This is what makes me suspect about the bearings. Also, almost all the problems I experienced yesterday were with cutting forces involved, never with the spindle turning free. Could it be that the extra heat and torque that's building up because of a damaged bearing is what's making the VFD triggering for overcurrent? What puzzles me still is when the spindle was too hot and with no load the VFD only whined and couldn't make the spindle turn. This, as Jon pointed out, recovered on its own a few minutes later. I'll be there doing some tests in a few hours so I'll let you know if I can note anything new. Again a lot of thanks to you guys for being so kind and helpful! :) El sáb, 4 mar 2023 a las 15:51, Leonardo Marsaglia (<ldmarsag...@gmail.com>) escribió: > Hi guys. > > Sorry for the OT but I'm having a strange behavior with my spindle and I'm > a little worried. > > The problem I had today for the first time is the spindle was getting > really hot and started to slip (you could hear the frequency from the > inverter was on spot but the rotor sometimes wasn't even turning).After a > few seconds of slipping the VFD triggered the over current alarm and the > spindle was stopped. Once the the spindle cooled down it worked perfectly. > This never happened before but also I must clarify that today the ambient > temperature reached 40⁰C and I'm sure that under that roof where the router > is placed there were 45⁰C so I suspect this has something to do with the > problem. > > The spindle is rated 11kw of max power output and is air cooled. It has a > built in fan motor so it doesn't rely on spindle speed for cooling. It > always gets warm (there are several labels on the spindle’s body for > caution because of the heat) but nothing like today. > > Could this be normal because of the extremely hot days I'm having here? > Should I think about changing bearings or even rewind the motor? I've only > had the over current alarms when the spindle was too hot. > > I will be really thankful if you can share your thoughts about this. > > Thanks for your help as always! > > Leonardo. > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
