The Y axis on this machine has started stuttering pretty badly, and I'm not sure where to start to fix it. Here is a quick video of what it's doing

http://www.youtube.com/user/pontiacg.../0/spFBKkSmHTk

The X axis does this too, but not anywhere near as bad as the Y axis. It seems to be random too, sometimes it's not as bad and other times it gets a lot worse.

Are these just out of tune or is it possible that the linear encoders are not working right? The DRO seems to be working perfectly fine, though I have not measured to see if it is still spot on.

I have no idea where to start with this, but it is bad enough that it's useless for any work so I really need to get it fixed!

Thanks!