Z-axix linear bearings

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antiklesys
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Re: Z-axix linear bearings

Post by antiklesys » January 29th, 2017, 2:22 pm

@Neotko : did you have a chance to upload the Z bed stabilizer files for the UMO+ yet ? :)

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Neotko
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Re: Z-axix linear bearings

Post by Neotko » January 29th, 2017, 2:41 pm

Oh no sorry! Much testing this weekend. Will try tomorrow!!

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nilrog
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Re: Z-axix linear bearings

Post by nilrog » February 1st, 2017, 7:46 am

Finally had some time to replace the bearings. This is a short video of how bad the stock bearings were :shock:



With the new bearings...it's a totally different printer. Not a single glitch on the prints...and the buildplate lowers itself when the print is done :-P

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LePaul
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Re: Z-axix linear bearings

Post by LePaul » February 1st, 2017, 9:09 am

Yikes, that's bad

Looks like the surgery to replace went well?

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nilrog
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Re: Z-axix linear bearings

Post by nilrog » February 1st, 2017, 10:22 am

Yes, I will post some pictures in my printer thread.

But I have to do it from my Mac due to the image-rotate issue with the forum software ;)

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LePaul
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Re: Z-axix linear bearings

Post by LePaul » February 1st, 2017, 10:27 am

....which only you seem to have, for the record :)

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nilrog
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Re: Z-axix linear bearings

Post by nilrog » February 1st, 2017, 10:38 am

Using the most popular smartphone... ;)

If it is as you say that thumbnails are wrong, but not the original, then it is truly an issue with the forum software...because that thumbnail is generated by the forum ;)

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LePaul
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Re: Z-axix linear bearings

Post by LePaul » February 1st, 2017, 10:53 am

My iPhone uploads images with no issue, the latest pics I uploaded were on from there. Be sure that the thumbnail you see on the iPhone camera roll is aligned right too.

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Neotko
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Re: Z-axix linear bearings

Post by Neotko » February 1st, 2017, 10:55 am

Test
IMG_4624.PNG
test 2
IMG_4625.JPG

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LePaul
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Re: Z-axix linear bearings

Post by LePaul » February 1st, 2017, 10:58 am

Yes, the vertical is where I have seen issues...where the thumbnail is wrong but the pic displays fine once clicked.

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nilrog
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Re: Z-axix linear bearings

Post by nilrog » February 1st, 2017, 11:01 am

Use the square format and it gets even worse.

mutley
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Re: Z-axix linear bearings

Post by mutley » February 2nd, 2017, 7:19 am

Been having problems with my UMO and UM2 intermitent banding. Lots of investigating, often putting it down to the cross rod gantry bearings. Changed them with cheap chinese bearings, no difference.

More recently a blown UM2 heatbed, and known ever so slightly notchy bearing on UMO Z axis, prompted me to go for some quality LM12's. They arrived today, fitting in next day or so. They came in a box, wax proof paper, id forgotten what a quality bearing package looked like. Very much looking forward to getting these babies fitted, and hopefully saying hello to aligned layers again.

But having gone for new bearings, and doing some searching, I was surpsied to see how many Z axis bearing issues do occur on these machines. Thinking logically about it though, it is not that surprising.

Will update once fitted.

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Re: Z-axix linear bearings

Post by LePaul » February 2nd, 2017, 8:42 am

That's disappointing to find out that what's in your expensive printer isn't always high quality parts.

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nilrog
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Re: Z-axix linear bearings

Post by nilrog » February 2nd, 2017, 10:14 am

Yes, in a cheap Chinese clone...fine. But not I am original Ultimaker.

But I have to give good credit to 3D-Verkstan for how they handled this :)

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Re: Z-axix linear bearings

Post by mutley » April 15th, 2017, 12:21 pm

Just a quick update on my use of the Japanese LM12 bearings for the Z axis.

Disassembled machine as required to complete the installation, cleaned and lubed the 12mm rods, carefully dropped the new bearings on, they felt a little tight, and almost notchy, but as per usual with a good fitting LM bearing, a bit of back and forth movement soon had them feeling a lot smoother (but still ever so slightly notchy, didnt feel like "ball raced" if you understand me).

Re-assembled and completed a few test prints. All good, no banding evident. Pleased the effort (and expense) paid off.

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