Topic: Issue with z-home/z-offset calibration
I've been having an issue for the last few months with my press that is making it essentially unusable. I am able to home the x and y axis just fine, and am able to use all three independantly. However when I try to run the z-offset calibration or home the z axis it will deploy the probe like always, and then just drive the bed up until it drives the hotend into the bed. If i'm running the z-offset calibration it will *sometimes* move the probe over the bed and then probe in the wrong spots; usually 3 times in the same spot, move on the y axis by one or two inches, and then probe once before driving back into the wall and then it drives the bed into the hotend again. I've tried m502/m500 to reset the firmware settings, I've tried using m851 to manually set the z-offset, and no matter what I do it happens. I tried getting in touch with solidoodle support but the articles they sent me as a suggestion are...laughable at best.
http://i.imgur.com/5NmwAEK.png
the only one I can imagine that might have something to do with it is the trimpot one, but I've checked those and they are all good.
So far I have checked to ensure that all three motors have a good connection and their wires are not breaking. They aren't skipping steps as far as I can tell. And like I said before I am able to move the printhead to a specific location or tell it to move a certain amount in any direction and it will do that just fine. I also checked both the x and y endstops to ensure they aren't broken or misfiring, they are reading properly as far as I can tell.
I've tried running the newest version of soliprint, I've tried an old version, I've tried it on windows 7, 8.1, 10, and mac OS 10.10, I've tried using just the g29 command in s3d and repetierhost and they both run in to the same issue. As far as I can tell this seems to be a firmware thing, but I'm worried it might be an issue with the motherboard.
Any ideas to point me in the right direction would be much appreciated, Thanks!