I have a Shapeoko Pro XXL. Sometimes when I am initializing the machine or even in mid-project, the CNC stutters fairly violently on the y-axis and looses tracking on where it is on the table. My CNC used began doing this only occasionally but has gotten more and more frequent to the point that I can’t cut anything now.
I’ve been unable to reach support today. I really need to get a project out. Any suggestions?
If everything is in good condition and secure, power up, connect to the machine and try intializing — the machine should home the Z-axis as normal, and begin moving both X- and Y-axes — the X-axis should finish homing, while the Y-axis motors should turn until they time out — do they turn evenly and in synch?
If they do, re-install the belts and re-tension per the instructions and see:
If you continue to have difficulties, let us know what you found from the above at firstname.lastname@example.org and we will do our best to assist.
I had something like what you described happen toward the end of a job and then again when trying to re-initialize the machine after the incident. I shut down, powered back up and it initialized ok. I then shut down and checked belt tensions and found one had loosened up. I re-tensioned them and have not had the issue since. It could be as simple as the two y belts being significantly different tensions…Maybe…
While I was doing the re-tension I found that the clip for the belt that loosened up was a little under a 90 deg bend while all the others were slightly over 90 deg…like it was over-bent. I flexed it back open a bit and it seems to be holding tension now. It may be worth a check to see if belts loosened up and if so check the clips to be sure they are all bent the same amount and slightly more open than a 90 deg bend. Just my thoughts…
I appreciate all the help and suggestions. Glad to be connected to this community.
After I removed the y-belts last night, I noticed that the slider on the left rail wouldn’t move without considerable force. I couldn’t see any obstruction. I attempted to take the two-part slider apart, but even with all screws removed, it was still intact. I’m guessing some of those pieces either snap together or are glued. I used a rubber mallet and some lubrication (hope that doesn’t void any kind of warranty) and eventually got the sliders to move freely. I still can’t see any reason they wouldn’t move freely before. After replacing the y-belts, everything seemed to work perfectly.
Perhaps I had different tensions on the two belts and that somehow caused one set of sliders to bind? I don’t know.