Everything was fine. I had just done a test run of a new program with the spindle at 2000 rpm, things looked fine but when the program ended and the spindle stopped it sounded harsh. I placed the stock and started the program again and my spindle motor sounded horrible! Bad bearing, rotor scraping horrible! Emergency stop! Pulled the spindle motor loose from the tranny and tried 500rpm, bad noise! E stop again. Took the motor down and dissasembled it, polished the slight rust from the rotor and replaced the bearings even though them motor was smooth when turned by hand. All back together a week later and still nasty noise, sounded like somebody put a hand full of cannon grape in it. Took the motor apart again looking for signs of contact or scraping. Nothing. So I got the hair brained idea to try a very low rpm. It sounds like crickets in there. I have attached an audio recording of about 90 rpm motor (10 rpm) spindle. The inverter is having a fit and the really weird thing! No alarm codes.
Now the spec's A06B-6055-H106 drive and A06B-1006-B908 motor.
Now the questions: have you ever heard this noise before? Can you tell if the problem is in the inverter or the motor. How do I fix this (anybody have schematics/diagnostics?).
I have two theorys: One of the windings in the motor bad, or IGBT or its drive. Sounds to me that one of the three phases is mucked up. I will get my O scope out and look at each phase but I don't know what a proper wave form looks like (I hope I can figure it out) and then my ohm meter and check the windings.
Dan
Way out in Summerville, Oregon