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ginobrancazio

Movement seems stiff, is this right?

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not saying this is your fault, but if you're not careful inserting the rod the linear bearing can be damaged. could be the case that there was a ball bearing left over from the factory.

if things have not improved by now and if you suspect a bad bearing, i would loosen everything, all the belts including short ones, and see how the movement is. if that still shows a lot of friction, remove the entire hot including small rods and try to inspect. once you've looked inside to see if there is any damage, carefully slide a rod through the suspect linear bearing to see how it slides.

 

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Hi @fluxline, thanks for your help. Perhaps I should have been a bit clearer!

The BB fell out when I picked up the linear bearing, before I put the rod in so I'm sure I didn't damage it myself. I imagine it was just left over from the factory perhaps.

The issue I have is that one of the rods moved perfectly fine through both linear bearings (lovely and smooth) but the other rod was not moving smoothly, so I suspect the problem is the rod and not the bearing (though one of the bearings was worse than the other!)

I'm going to try applying a drop of oil to the rods to see if there's any improvement to the jerky motion. Can anyone recommend a good brand or type of oil?

 

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I don't know why UM seems not to be able anymore to deliver straight rods. I had the same issue on my UMO. However, I replaced it with rods from Misumi.

It is interesting that I have a 'guest' UMO atm. It is an older model with electronics version 1.5.6. But it has straight rods and concentric pulleys!!!

 

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I had the same problem with the end caps being far too snug a fit for the rods when screwed on tightly. Loosened them and then spent the next 2 weeks periodically picking up nuts and bolts as they fell off the machine - if you leave them loose, they work themselves apart from the vibration of the machine! As a result also, one of the rods started pushing out sideways. Not good. In the end I printed these

 

http://www.thingiverse.com/thing:23835

[gr5 edit: fixed link]

and after installing them everything is running smoothly and nothing is falling off anymore...phew!

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I get a 404 error from that link.

BTW, there is also a really cool nut holder for the inside side of the rod ends. Just search youmagine or thingiverse for "ultimaker nut holder" or something like that. It is U shaped, so you can put it on without removing the rods. Makes installing and removing rod end covers a million times easier.

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