Hi guys,

I have Shopbot Standard 20212 , and few weeks back , I start having hard to understand and pin point problems with the "Z" . Initially I was suspecting "statics" , so I eliminate "grounding" problem , to make sure are not the statics what makes my Z to go uncontrolled.
Anyway long story short , Z is not lessening, it is going down less few mm than should go , occasionally out of the blue go up , even when I try to "Z0" soma time , fails , Z going in the routine up. Same times when lives 0,0 (Z, Y) point , makes a few mm up then go , and obvious , never recover Z position again. Lots of debugging is already done...try to see if any similar frustrating experience, and some idea , where to start to narrow , seems like , everything I have to do from this point is going to cost. Hope to spend correct. Thank you for your time. Regards DAN