Hello! First post and hoping for some help. I have a Longmill MK2 that I didn’t originally set up, but I’m trying to get it up and running. One very strange (I think) issue I’m having is with the Z-axis.
When I jog the z-axis in gSender, it will only travel in one direction until it comes to the end of its travel, then will move in the opposite direction and continue in that direction until it comes to the end of the travel, regardless of which “direction” I select to jog it in. I can basically hold down the jog button and it will infinitely move up and down as it comes to the end of its travel. There are no limit switches actively connected to this axis so I’m not sure how it “knows” its at the end of the travel. And it is the only axis that behaves this way.
As you can see from the video, the jogging of the Z-Axis is pretty much a random bag of tricks. The behavior seems to be different each time I jog it. Also notice the coordinates for the Z-Axis. Not sure if that is a clue to what is going on or not.
Please ignore the fact that there is an induction sensor mounted on this axis. It is not plugged into the board.
How much of the machine did you not set up. Is that pure mechanical or did it come completely installed with router/spindle, computer/sienci panel with a version of gsender (or another sender programm? ) installed?
I have never heard of this behaviour before, but I feel something akin soft limits in gsender is involved. Only gsender would trigger an alarm and not reverse direction and continue.
The machine was completely assembled with the exception of the limit switches, which I have installed but they are currently disconnected because this Z-axis issues really messes with the homing function (as you could imagine). I am using the latest version of gSender.
Not that it matters much, but that helps others assessing the problem. I own an MK2 with the old controller and no switches, and run an old version of gsender because newer versions do not add much to my setup.
Have you tried to reinstall Gsender including the thing to do with the mystical rc file according to this here screenshot of the installation manual?
Well, funny you should mention this. I got to thinking… I never actually flashed the control board with the correct firmware for the model. Unfortunately, that did not solve any of the issues. BTW, I did add a link to a video of the issue in the original post.
UPDATE: Just as a test, I switched the cables between the X and Z axis on the control board, and each axis behaved correctly. I switched them back to their correct sockets and everything still works correctly and I was finally able to finish homing the machine. ¯\_(ツ)_/¯
