+- Spokane Create! Forums (http://forum.spokanecreate.org)
+-- Forum: Spokane Create! (http://forum.spokanecreate.org/forumdisplay.php?fid=1)
+--- Forum: Projects (http://forum.spokanecreate.org/forumdisplay.php?fid=4)
+--- Thread: Grbl CNC Router Troubleshooting (/showthread.php?tid=320)
Grbl CNC Router Troubleshooting - Jeff_W - 01-31-2016
Hey all, hoping to pick the brain here for some input-
I recently updated my GRBL shield to 0.9j, and now my z-axis behaves somewhat erratically. It will sort of randomly reverse direction when issued a g code through UGCS. For example, if sent a G00 Z-1 F25 it will occasionally move in the positive direction instead of negative.
I've been trying to set up homing and a touch probe just so you have an idea what pins and settings I've been tinkering with. In addition, when the Z axis behaves and I try to home it, it tends to hit my homing switch and stop and buzz. I've played with the debounce setting without much luck.
Cheers,
Jeff
RE: Grbl CNC Router Troubleshooting - ABearden - 01-31-2016
Did it previously have 0.8 or earlier on it? The Z-limit pin changes when you move to 0.9, which may cause issues.
Have you checked wire continuity to the Z-motor? A dead/high resistance leg can cause some oddball movements.
Have you checked GitHub for any known issues with 0.9j?
Are you using a shield? And if so, which one?
RE: Grbl CNC Router Troubleshooting - IdeaMakers - 02-01-2016
There does appear to be large difference in settings between the versions, so you'd have to go through the setup files completely. Could also be noise or a bad ground when doing probes, disconnect the probe and make sure everything is working and then add in the probe. Good Luck!!
RE: Grbl CNC Router Troubleshooting - Jeff_W - 02-06-2016
Apologies for not getting back to the thread sooner; I thought I had subscribed to it, but apparently failed.
I did resolve the issue (which ended up being a continuity issue- apparently jostled a z-axis connection to the stepper loose from my shield while I was doing the limit switches).
@Abearden- Yeah, I had upgraded from 0.8 before doing the limit switch install. I was pulling my hair out for a bit regarding the z-limit pin. I don't navigate github all that well, so I didn't discover the change right away.
I'm still tinkering with getting probing to work, but haven't really had a chance to get back to it, yet. I'm going to mill a custom touch plate to use for it at work.
Thank you for taking the time to make replies, I do appreciate it.