Hello all.
I have a KO Lee Scepter C1020N grinder that is the subject of today's post. We obtained this grinder at auction about a year ago, and it's been a fight to get up and running since.
The first issue we had was two malfunctioning drives. Both NUM AC Monodrives were showing odd faults. Schneider Electric in Greensboro, NC repaired both drives and I've got no drive faults.
The machine is currently up and producing parts now, I'm happy to say.
Unfortunately, it's exhibiting some odd symptoms on the Z axis. When moving in one direction, the movement seems pretty normal. The other direction, there's a 'pulsing' or jumpy movement. It doesn't seem to be catastrophic, as I'm grinding just fine with it, but I have a feeling it's a portent of things to come.
Removing the servo and moving the axis gear manually shows no increased resistance in that direction, so I'm fairly certain the issue isn't in the ball screw itself.
Anyone have any direction I can look on this? I know I'm specifying that it's NUM equipment, but is there a general malaise that can cause this?
Thanks very much in advance,
Ralph