Quote Originally Posted by Malcolm View Post
I have a chinese 6060 CNC.
It started to give problems with the Z Axis.
I eventually found the solution. The motor for Z is coonected to the shaft with a linc with 4 Allen key grub screws. By chance I found that two of the grub screws had never been fully tightened. As soon as did this everything worked perfectly. I suggest you give it a try. Of course this might not be your problem...Good luck Malcolm
This is the most likely cause.!
Another would be that that axis is binding or motors are over tuned. Both these things would cause your problem.

When you say use it at work are you using same this machine or another just like it.?
If it's this machine are you using same computer at work.?