I have a 1980's vintage Knee mill with FANUC 3M control and the "yellow cap" servo motors. It works like a charm with one niggling problem.
Usually (especially when it is cold), on start up it gives an error that basically says a motor is not responding properly to the start signal (servo 02 error). After several minutes, something warms up and everything starts up ok. Another symptom that concerns me a bit more is that one (or maybe two) of the yellow cap motors occasionally starts emitting a buzzing noise. If I move the axis a bit, the buzzing stops.
I have to believe these two items are related.
I have been thru FANUC troubleshooting (by the way, those people are GREAT - no charge, and as much help as you need) to the point where the next step is for them to send out a tech to start swapping out $1000.00+ compenents until they find the problem, and at that time I will have 3 times what the machine cost me into a repair.
So helpful CNC-Zoners, any ideas?
I am thinking of just sending all the motors in to a re-fitter to check them all out.
I have already replaced one of the VC units.
I have dismounted and cleaned the motors and encoders.
The guy I bought the VC unit from thought maybe it was a bad encoder, but I did not find anything obviosly wrong with any of them.
I hope this is enough info for someone to point me in a direction that will not cost me my firstborn to implememt.
Thanks!!