I'm not sure what it could be. It's possible it's stuck in one of the other gears in which case try changing gears like compuslave suggested. I would think the spindle would just oscillate back and forth while it tries to change gears if this was the case.
okumatech mentioned checking parameter #72 but if you have the green screen (OSP-5000L) then the parameter numbers don't go that high.
I doubt the max speed of your LC-50 is 3000 rpm. The Okuma LC-10 to LC-50 with green screen controller had lower RPM ratings than later LC machines. I have one section of an OSP-5000L operation manual showing the LC-40 top speed at 2500 rpm.
My OSP-5000L LC-20 has a top speed of 3500 compared to 4200 for all my other LC-20s with 5000L-G control. |