I am at an absolute loss. Scratching noise coming from rear motor motor/bearings, V-Core 3.1
So, to troubleshoot this I've:
-Replaced bearing stacks
-Rebuilt and realigned the entire top of the printer. Like completely removed the whole top, resquared it separate from the printer, and replaced.
-Verified spacer shims
-Belts are tensioned to an 85hz strum.
The only thing I haven't replaced, but these are LDO motors that are like... 6 months old? Maybe 8. But I haven't had motors really fail with this noise before.
But yeah, I have no idea what's causing this noise, but the motors are only thing I haven't replaced. Does anyone recognize this noise? If replacing the motors doesn't resolve it I think I'll go crazy 😖
3 Replies
I hope your steppers were disconnected for that movement, otherwise you might fry them from the steppers acting like generators.
Anyways, use a screwdriver as a stethoscope to hear where the sound is coming from.
Using a specific Hz isn't a good way to tension the belts, use the built in macros. You probably over tightened the belts and have caused premature failure
Yep, steppers were disconnected before this. Efficient motors can make unintentionally efficient generators 😬
Yeah, I'm thinking that's what I must have done RE belt tension. The noise seemed to start coincidentally when fixing the frame square (printer got bonked by stuff being moved next to it). Printer seemed to be running fine before I adjusted the corners a bit, so I was thinking I somehow damaged a bearing, but nothing I've done so far has fixed it. So I'll have to assume that I ran the belts too tight.
I actually just stumbled across a spare motor I must have bought a while back, so I'll try an in situ swap out and see if that improves things.
Swapped out that one motor. Didn't change anything, so swapped out all the bearing again, and while the frame is in a good spot (this is my shitty, wobbly build plate that I leave on during repair jobs, but just about .1mm plate variance), I still seem to have something insane going on with the resonance. Maybe it's just my fmmm implementation? I'll try going back to printed motor mounts tomorrow and see
(Belts could be tightened a little more and would calm down the <125hz, but all that above 175hz is what concerns me)
