I’ve just replaced my OMTech smoothieware board with a Monport GRBL, so still trying to figure out the new settings.
K40 does not have machine move buttons, I have to use light burn. When I click to move any direction (X or Y) the head moves, then bounces back almost to its original position. I can also position the head by hand with no resistance. With the old board, I couldn’t move the head by hand unless the machine was powered off or in an error state.
Belts are tensioned and it cuts well, so no issues moving while receiving commands.
Your video isn’t working. It just spins and says “Your video will be ready soon”.
What’s interesting is someone else has very similar symptoms with their K40. The Y axis doesn’t respond properly, it bounces back on small moves. They found if they try to move more than 6mm, it will move but anything less than that and it bounces right back to home position. Can you confirm this behavior with yours as well?
Video works now, it just hadn’t finished uploading.
It doesn’t matter how large the step, it always bounces back, and it’s not the full distance, just something random. Gets worse the farther it is from home though.
Ok, I just read through the entire other thread and it sounds like my problem could be similar/related, but isn’t the same. I’ll answer the main questions from that thread here:
The X stepper motor itself is new, belt clean and tight.
This problem also happens on the Y axis, but that motor was not replaced.
It does not matter how large or small the step is, the head always bounces, both X & Y. I’ve tried 5mm and 20mm.
This problem never occurred until I upgraded the board, so I believe it must be settings/software or the board itself.
Recheck the motors connections, identify the coils of the stepper motors with a voltmeter at the plug terminals, the plugs may be connected incorrectly.