Up is +Z and down is -ZOriginally Posted by Smertrios
Anyway usually there are problems when moving up because the gib can shift and make the slide tighter, so I haven't heard of any problems when moving the head down...
I assume you are using lube on the ways?
Could be that the gibs are just generally too tight, or too loose, so that there is a binding movement...
I'm running a new z-axis at 30 ipm rapids...
You may want to reduce acceleration or velocity, and maybe play with pulse width (what control software are you using?)