Haven’t used much of my LR3 router, today testing the drag knife, runs good till Y2 stepper motor stopped working and made grinding sound, I switched wires (Y1-Y2) inside the control box, it moves no problem other than orientation, switched wires back and Y2 still not working properly. Is it time to look for a new board? all steppers and skr were purchase from V1 store. Thanks for your input.
That says most likely the stepper is losing steps.
You haven’t given enough information. When the Y2 stepper is losing steps, what is the Y1 stepper doing?
What do you mean by this? Y axis on an LR move in tandem except for autosquaring.
Did you power down the SKR before switching wiring?
If you did, when you powered back up, did you home it? If so exactly what happened during the Y axis squaring?
This doesn’t make sense if both Y steppers were working fine in the “Swapped” configuration.
Not yet.
We need to do some better troubleshooting on this.
I’d start with the machine its stock configuration, home it, then run the job. Does it repeat?
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Ok, I’ll try to explain better this time.
LR3 worked no problem until today.
Y2 stepper not working other than making grinding sound, so Y2 not moving at all. Meanwhile Y1 works no problem(moves ok) so auto home and move with touchscreen both won’t work.
Unplugged power, switched Y1 and Y2 wires inside the control box, and switched on, now, Y max became Y min, hence auto home Y won’t work because of the orientation, but move with touchscreen works, I can jog the gantry from Ymin to Ymax and Ymin to Ymax no problem, both Y1 and Y2 steppers behave normally no grinding sound.
What could cause this strange behavior
It seems you have some kind of intermittent connection that you temporarily fixed with the swap.
Is it repeatable? If you put it back to the swapped configuration then does it work correctly again?
At this point I’d like to see high resolution pictures of your SKR board and your wiring to it, including detailed shots of the two connectors on the SKR for Y1/Y2, and of the Y1 and Y2 stepper connectors. If you can do it, shots of the back side of the SKR as well.
I’ll take some pictures tomorrow and yes problem repeatable. Does this rule out faulty stepper? Thank you so much.
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Possible intermittent open wire on Y2 motor, probably at the connector for the extension cable…
We haven’t ruled anything in or out yet, but it is very unlikely that you have a bad stepper motor. I’ve never had a stepper fail on me, and I have had machines that had many thousands of hours on them. Wiring to the stepper, or contacts/connectors do fail and this has happened to me many times.
An intermittent wire or contact seems possible, or a bad solder joint or some other connection problem seems more likely based on what you’ve reported so far.
Very possible. But, if there is an extension cable and it is far away from the SKR board then this becomes less likely.
To be highly repeatable when flipping Y1/Y2 back and forth at the SKR is very curious. I bet we find some curious interaction between SKR and its connectors and the stepper connector or wire.
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When my Y started acting funny, it was a broken wire to the endstop. If you switched the wire to the driver, but didn’t also move the end stop, you were testing the Y2 motor against the Y1 end stop. Just thinking out loud.
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problem solved, loosing Y2 connectors at control board, with a bit of hot glue now no more intermittent open wire. btw, I feel all the connectors are kind of loose at control board side, especially these white extension cable connectors, feels like there’s no resistance when you plug in or out.
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Did you do this step???
https://docs.v1e.com/electronics/skrpro/#molex-and-jst-connectors
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haha, that’s why! stupid me
Nah. Not stupid at all. I did it on my first build with an SKR as well. Get to that point and your excited to get it running and its easy to miss things. Just take your time pulling them off and it should make a big difference for you!
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