This is the week of misc. problems for me it seems.
Normally my LR does great and can push my arm pretty well on X and Y probably pushing a couple lbs of force but occasionally like 1/10 times its an absolute dog that can barely push itself around and skips steps all over the place.
I’ve got TMC 2209’s in an SKR 1.3 board with a 6amp PS powering the board, a buck converter, pi3, and 2 fans.
Here’s what I’ve done to troubleshoot so far with no luck. Eventually it starts working again like nothing ever happened but I cant figure out what has changed. I’m assuming it has to be power or temp but I cant find a smoking gun.
Checked grubs not them, def skipping steps.
Confirmed Stealth Chop Is Off
Lowered speed
Lowered Accel (This helps a bit but not enough)
Checked for overheating (protection not tripped) but chips are on the hot side at 130C; Motors are fine and only warm to touch,
Ran TMC diags all looks ok
Made sure stealth chop was off.
Upped Current (900 is useless, 1100 runs with some skipping, 1300 runs great but everything gets hot.)
I’m kind of at a loss. Next step is to order a bigger power supply and see if I’m just running short on current.
It looks that way though for the life of me I can’t figure out what.
I have a macro that sets speed, acceleration, current, and sensorless endstop sensitivity. Then saves it to eprom via M500.
Since recovering I reran that macro and it’s still working fine.
Maybe I set something manually by accident then ran my macro which would have saved it.
I’ve added a M502 to my macro to load from default settings before customizing then a M500 to save after I’ve customized. Hopefully that will load a known good state each time.