How to grease linear rails

Building your RailCore and having questions or issues?

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justinsgray
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How to grease linear rails

Post by justinsgray » Fri Jan 11, 2019 5:20 pm

I think my linear rails of squeaking. At least, there is a consistent and fairly loud sqeak whenever the print head is near a particular portion of the bed near Y=0. The only thing I can think of that would squeak in a location specific way is the rails. So it seems like my y rail needs some grease.

My first inclination is to remove the y-rail completely, disassemble and clean it all, and then re-grease the carriage directly. But I suspect that inclination is due to the multitude of "how to grease your cheap Chinese rails" videos I have watched. Since my machine came from Project R3D, they supposedly already cleaned and greased all the rails themselves. So perhaps mine just needs a bit of extra grease added...

But I don't see any grease ports on the carriages themselves so I guess I'll just spread a bit of lithium grease onto the rail guides and move the carriage through them, then wipe off any excess.

Anyone have any experience with greasing linear rails?




PlasticMetal
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Post by PlasticMetal » Fri Jan 11, 2019 6:32 pm



Emparus
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Post by Emparus » Fri Jan 11, 2019 9:43 pm

I first would check the alignment of the rail and determine if there is a dent in the rail. It would run rough if dirty but squeaking is quite serious. Not even sure how that would be possible? The Z might do that if not lubricated and you have brass nuts running on the leadscrew. Would be great to have a list of lubrication people use. Hiwin has an assortment of greases, but impossible to get anywhere.


Topic author
justinsgray
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Post by justinsgray » Sat Jan 12, 2019 12:38 am

Its definitely the y-axis rail. Here is a video of it (https://photos.app.goo.gl/UtQs61Hy8LWufSDs5). Its only at the extreme y-min edge of that rail, but from the video you can see that its consistent there.

Im not sure how to check it for a dent, but I do have access to a decent surface plate so I can check it for level if need be. I guess I'll have to take it apart and clean it out as a step 1. I'll run the video by the folks at Project R3D and see what they say as well.


Topic author
justinsgray
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Post by justinsgray » Sat Jan 12, 2019 1:02 am

Guess what, despite my saying "its definitely the y-axis rail" ... it wasn't :)

Joseph from Project R3D instantly identified it as squeak from the idler pulleys. One of them had drifted up just tad and was squeaking. Once I pushed it back down the squeak went away.

So I think the solution is to add a few extra spacers on top of the idlers to take up the dead-space there. That way the pulleys stay correctly aligned vertically.

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