Y axis bearing mounting mod MK2s- Rods scored
 
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Y axis bearing mounting mod MK2s- Rods scored  

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mick
 mick
(@mick)
Active Member
Y axis bearing mounting mod MK2s- Rods scored

Hi there,

Our Mk2s has been running great for a few months but i am now having issues with bed leveling and the y axis bearings.

The right side rod is now scored and the noise is increasing. I have personally blamed this on the clamp system for the bearings possibly distorting the already cheap bearings. Im a engineer by trade and thought the whole bed set-up was rubbish from the get go as i would traditionally of used a solid frame myself like on CNC's etc i have worked on. It seems sadly drilling etc is required for most box section upgrades so i am not keen to do one when under warranty.

Anyway my question is if the bed seems higher now on one side should i try and lower it or ultimately fix the rod and bearing issue when i have the parts? And does anyone have any good bearings to suggest as an upgrade. I dont want the plastic things as i just do not approve of using bushings that will wear when a good linear will last forever if lubed. I am also going to use a printed clamp design for the bearings going forward to ditch the u clamps as a weak spot.

Another cause i will check after this print i suppose could be that the heat bed bolts are loose due to the increased vibration on the y axis right side

I am about to upgrade it to a mk2.5 anyway so will be taking it to bits soon. It is still printing perfect it just fails the occasional cal and i can see it catches the rear right corner on cal.

Thanks
Mick

Postato : 27/01/2018 5:25 pm
MechLink
(@mechlink)
Estimable Member
Re: Y axis bearing mounting mod MK2s- Rods scored

Sounds like a bearing is going out, I had one do it to me after 6 months on mine, had to put a new rod and bearing in to fix.

See my stuff at
https://www.printables.com/@MechLink
https://www.myminifactory.com/users/MechLink

Postato : 28/01/2018 1:36 am
mick
 mick
(@mick)
Active Member
Topic starter answered:
Re: Y axis bearing mounting mod MK2s- Rods scored


Sounds like a bearing is going out, I had one do it to me after 6 months on mine, had to put a new rod and bearing in to fix.

That is what i suspected. I had the bed within .02 across all corners when i built it so something has changed.

Prusa have sent me some new rods and bearings so alls well that ends well. I am going to fit some better mounts for the bearings too as i suspect the u clamps will not have helped.

Thanks for the help
Mick

Postato : 29/01/2018 8:59 pm
MechLink
(@mechlink)
Estimable Member
Re: Y axis bearing mounting mod MK2s- Rods scored

I believe mine was just a bad bearing and went out, as for the u-bolt if you over tighten them they can cause and issue with the bearing as well.
I haven't tried the printed holders for it though.

See my stuff at
https://www.printables.com/@MechLink
https://www.myminifactory.com/users/MechLink

Postato : 30/01/2018 6:03 am
mick
 mick
(@mick)
Active Member
Topic starter answered:
Re: Y axis bearing mounting mod MK2s- Rods scored


I believe mine was just a bad bearing and went out, as for the u-bolt if you over tighten them they can cause and issue with the bearing as well.
I haven't tried the printed holders for it though.

I have it built up with the new bearing holders on now and some NB japanese bearings. I will let you know the results but so far it seems great.

Postato : 07/02/2018 4:32 pm
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