Hi All,
I've had a couple of issues with my Y axis intermittently on my prusa
i2, and today I've got to the bottom of it because it's not intermittent
any more... The LM8UU linear bearings on one rail like going in one
direction but not the other. They resist quite firmly when pushing one
way, the other direction they glide like normal. That happens even after
disconnecting them from the Y carriage - so it rules out misaligned rods.
They used to glide fine after both build & recent rebuild (partly
inspired by this issue but it was intermittent then and consequently not
identified).
I'm guessing lubrication may help, but a little puzzled by the specific
issue and not sure if replacement would be better in the long term (is
it possibly a sign of damage - perhaps caused by not lubricating to date?)
Rebuilding will be painful - I've just rebuilt once and I'm going to
have to rebuild to lubricate - should I just replace now?
Has anyone had any issues like this or knowledge of best way to treat lm8uu?
I've just read:
http://reprap.org/wiki/Linear_bearing
That indicates some bearings are packaged in 'cosmoline' to avoid
rusting which is sticky. Mine were packaged in some liquid, I'd assumed
it was lubricant...
Anyone got any thoughts?
Thanks,
Will.