Let me try to reexplain and tell what's happening now.
Three weeks ago everything with my cnc router was working perfect. In fact for the last 6 months it's run like a clock. Then all of a sudden things went south. Let me try to explain. All the axes XYZ run erratic. Using the jog mood in a positive move, sometimes it will run that direction and then it will run in a negative direction. In MDI when you program a direction it does the same thing, you never know which direction it's going to go??? I've sent back my G540 to the factory (twice) thinking it was a faulty board and it's been returned checked out 100% with no apparent problems. I'm running Mach3, so I dumped the program totally, reloaded it and the drivers, No Change? I changed my parallel cord, No change. I tried another computer, No Change, I've changed motors and rewired, No change. My pulse speed is and has been at 15, and I did enable Sherline mode with no change. Through this whole thing I found out that when for instance I'm running X + and I put pressure on the carriage, it will start to move back in the X - direction??? I am not a technical person, Beyond pressing the "go button" I really don't have a great understanding of electronics. So if you think you can help, please make it simple. Dennis