I have a 150 inch pound servo motor set up with Galil controller
hooked to a vertically oriented ball screw with 1/2 inch pitch, supporting
approximately 500 pound load. When moveing straight down at about 400 to
500 inches per minute, it "bangs" like the servo is suddenly trying to change
directions and the drives fault out. It only does it on the down stroke.
It does it while jogging down and more often after releasing the jog key.
It does it more so when I increase the weight it is moveing with a load of
approximately 75 pounds. It does not seem like the system should be overloaded because when going down, if I don't stop the system it has
enough force to bow a solid wooden table of 2 x 6 construction by 1 to 2 inches. I know thats not very scientific, but it appears to have the ability
to exert hundreds of pounds of force. I think I may have a tuning issue.
Any thoughts?