Ask not for whom the bone bones! It bones for thee!Ugh, I think the Z motor is boned. It has now shattered my glass bed, and it seems to jam up about 20 minutes into the print job every time.
Somebody was dicking with my bed leveling adjusters, so the Z motor was constantly baby-stepping to make the bilinear leveling work out.Ask not for whom the bone bones! It bones for thee!
That sucks. Any clue what may have caused it?
That shouldn't kill the Z motor.Somebody was dicking with my bed leveling adjusters, so the Z motor was constantly baby-stepping to make the bilinear leveling work out.
It gets pretty hot, and the failure seems to happen hot.That shouldn't kill the Z motor.
Is the motor running hot or anything?
oh shit.Grab a DMM and measure the voltage on the face of the VREF pots. Thing might not have been adjusted right from the factory and it's cooking the Z motor.
Conductive screwdriver is fine provided it's got a plastic handle, or you use a small plastic bag or whatever over a metal screwdriver handle so you don't short the pot to your body.oh shit.
How do I adjust it if that's the case? Do I need a screwdriver that's non-conductive?
Should I measure the voltage of the X or Y VREF pots, or is there a specific voltage that I should be looking for?Conductive screwdriver is fine provided it's got a plastic handle, or you use a small plastic bag or whatever over a metal screwdriver handle so you don't short the pot to your body.
A4988 Drivers
Vref set to ~90% of stepper rated current
Rs = 0.1ohm
X = 0,58v (0,725A)
Y = 0,58v (0,725A)
Z = 0,58v (0,725A)
E = 0,72v (0,900A)
I adjusted it down to .5V. All of the Vrefs were pretty on the money. I also turned the Z rod over, in case there was some schmutz binding it up. It's printing now, we'll see what happens. Since I can't print on glass on account of the new one is in the mail, not on the machine, I'm printing on blue painters tape, 'cuz I don't want to tear chunks out of the buildtac.Just measure the voltage, yeah.
Z doesn't need to be set as high because it's not accelerating things fast and has 4x the mechanical advantage with the leadscrew, dial it back to 0.50V if it's running hot.
Yeah, it happens on the X gantry.shift happening on the same axis every time?