motor shaft has wear where it meets the bearing. is this a normal failure mode?
where can I find replacement shafts? ( 8mm with 3mm keyway, 6374 motorI think it’s a maytech )
My motor was starting to make growling noises. I took it apart expecting that the bearings were going bad. What I found is the shaft had worn down where it contacts the bearing. instead of 8mm it’s 7.74 and you can feel this play when the motor is together. the bearings themselves seem ok when I used the shaft from a new motor.
is this a normal failure mode? bad bearings or belts too tight? i’ve been thinking it’s belts too tight. because I was running them tighter due to slippage when braking. ( 220lbs vs dual 15mm HTD5 belts ) i’ve ordered some motor mounts with idlers from @IDEA to try to avoid this problem.
I replaced one motor with this problem, but the second one needs help still. is it possible to find replacement motor shafts? ( 8mm with 3mm keyway, 6374 motorI think it’s a maytech )
Wow. I’ve never seen that before. Or at least i’ve never noticed it. Now i want to dig through my drawer of dead motors and see if i have any like that.
It happens due to the bearings getting locked and the shaft spinning inside the inner race, and since the bearings material is harder than the shaft it grinds it down
Id say opening them without damage is pretty much impossible, at least I couldn’t
The pulley is press fit, and so is the shaft in the can, I ended up cutting the pulley in half since I won’t use it anyway, it’s stainless steel so make sure to have a bunch of dremel cutting disks at hand
@akhlut has successfully opened, cleaned, and battle hardened my boosted v1 motors. Unfortunately he couldn’t do bearing replacement because it’s nearly impossible to ‘separate the shaft from the stator’ - if I remember correctly
I noticed on a set of older tb6380s the other day that the sockets for the two grub screws at the very end of the shaft had ovalled out, causing the motor to rattle a little.
while it’s possible I guess, my experience from other similar situations is the bearing will actually give out due to large external loads… (i.e. belt too tight)
this pitting looks more like corrosion pitting, or bimetallic corrosion, or other forms of corrosion, and not the typical burnishing that would happen in high speed metal to metal axial contact
