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Bushings for X and Y axis rods

Discussion in 'General Questions' started by adikted2astro, Sep 6, 2017.

  1. adikted2astro

    adikted2astro Active Member

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    Hey, does anyone know what size the bushings are for the x and y axis rods? I know the rods are 6 mm in diameter, but unless I tear the carriage apart, I don't quite know how big those bushings are. I'm assuming they are similar to double LM6UU (LM6LUU) bushings. The only concern I have is the length of the bushing itself. It's either 35mm, or 40mm long.

    I'm just curios because I want to start ordering backup parts for my R2, in case something happens. I don't want to have to wait for Robo to ship parts to me (which is what I had to do the past couple of weeks). Also, I'll be thinking about upgrading some of the components.
     
    #1 adikted2astro, Sep 6, 2017
  2. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    I had mine apart just yesterday and forgot to measure them. I will look at them later.
     
    #2 WheresWaldo, Sep 6, 2017
  3. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    40 mm ~ LML6UU
     
    #3 WheresWaldo, Sep 7, 2017
    mark tomlinson likes this.
  4. adikted2astro

    adikted2astro Active Member

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    Awesome, thank you! I was on the fence about 35mm or 40mm. I tried getting an accurate measurement from Mark's pictures in his thread on the C2 (upgrading to dual extruder on C2). From measuring on the computer screen I got ~39.298 mm. Granted, I should've just decided it was 40mm, but I didn't want to take the chance.
     
    #4 adikted2astro, Sep 7, 2017
  5. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    The graphite plugged sintered bronze bearings are hard to find but you can get 6 mm x 12 mm x 19 mm and doubling them up would work in the extruder head. That is what I am planning on doing with mine, at some point. The X/Y axis already has bronze bearings, they are 8 mm X 12 mm x 36 mm.
     
    #5 WheresWaldo, Sep 7, 2017
    Last edited: Sep 7, 2017
  6. adikted2astro

    adikted2astro Active Member

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    May I ask why bronze bearings? Are they better than stainless steel bearings (for this application anyway)?
     
    #6 adikted2astro, Sep 7, 2017
  7. adikted2astro

    adikted2astro Active Member

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    Ah, never mind. I see now. The bearings you are talking about are sleeve bearings/bushings. Not ball bearing. Those graphite plugged bearings are awesome, but you are right............very hard to find.
     
    #7 adikted2astro, Sep 7, 2017
  8. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Yes these are bearings, not bushings, even though they have no balls. The sintered bronze or the sintered bronze with the graphite plugs are quieter, support more area, require no lubrication (they are oil impregnated). I used them on everything except the Z axis on my R1 and it quieted the movement down considerably.
     
    #8 WheresWaldo, Sep 7, 2017
  9. adikted2astro

    adikted2astro Active Member

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    I'd be very interested to know where you purchased them. I can't find any that are even remotely close to 36mm long (for the 8mm x 12mm anyway). The best I could find was plug graphite, 20mm long.
     
    #9 adikted2astro, Sep 7, 2017
  10. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    I didn't use them on the X/Y, Robo did. But they did not use the graphite plugged ones. Are yours ball bearings? I took apart the little snap together end and the bronze bearings is what I saw. So all the 8 mm linear rail had bronze bearings and the 6 mm linear rails have ball bearings. That is just like Ultimaker uses them.
     
    #10 WheresWaldo, Sep 7, 2017
  11. adikted2astro

    adikted2astro Active Member

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    No, as far as I can tell, mine are bronze as well. I have no idea where Robo got those. I'm having some trouble with one of them on the x-axis. No matter what I do, there's a slight scraping sound coming from one of them. Not sure how to alleviate it.
     
    #11 adikted2astro, Sep 7, 2017
  12. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    #12 WheresWaldo, Sep 7, 2017
  13. adikted2astro

    adikted2astro Active Member

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    Those are definitely close. I think I can make that work.
     
    #13 adikted2astro, Sep 7, 2017
  14. Geof

    Geof Volunteer Moderator
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    @adikted2astro scraping? I think I'd double check your gantry is square and the timing pulleys arnt rubbing on anything. Takes quite alot to make a scrap sound with bushings :D
     
    #14 Geof, Sep 8, 2017
  15. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    There, I fixed that for you.
     
    #15 WheresWaldo, Sep 8, 2017
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  16. Geof

    Geof Volunteer Moderator
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    ;)
     
    #16 Geof, Sep 8, 2017
  17. adikted2astro

    adikted2astro Active Member

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    Good point. However, i already tried both of those................not the problem
     
    #17 adikted2astro, Sep 11, 2017
  18. Larry Garrido

    Larry Garrido Member

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    Anyone find a source for these? I cant seem to find any that are 40mm, just 35mm.
     
    #18 Larry Garrido, Jun 8, 2018

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