Grease

Discussion in 'BigBox General Chat' started by RTBiscuit, Oct 13, 2016.

  1. RTBiscuit

    RTBiscuit Well-Known Member

    Joined:
    Jun 2, 2016
    Messages:
    62
    Likes Received:
    5
    Seems like a bizarre post, but as it wasn't directly build related, or calibration related I thought i'd pop it in here.

    Having read many posts on here and in the build guide about applying grease the general mention seems to be for Lithium grease.

    my minor issue is I don't have any.. but I do have:

    poly urea grease - Parks; designed for bicycle bearings etc.
    Castrol multi purpose grease - designed for machine bearings; I use it on the lathe

    any reason either of these would not be as good?

    what I don't want to do is gunk up the machine; the machine is kept in a workshop is also dusty. but i'm going to try and cover it when not in use to keep the dust out of it.
     

    Attached Files:

  2. Dr Jeep

    Dr Jeep Well-Known Member

    Joined:
    Sep 12, 2015
    Messages:
    530
    Likes Received:
    169
    I think the advantage of lithium grease is that it's effective even when the parts are quite dry where as your muti purpose grease is a dust and crud magnet and if your workshop is dusty you could easily end up pulling muck into the bearings.

    Personally I've used gear oil and general grease on my previous printer and it was ok. though on the flip side you've invested enough in the printer that isn't it worth buying the right stuff ?
     
  3. RTBiscuit

    RTBiscuit Well-Known Member

    Joined:
    Jun 2, 2016
    Messages:
    62
    Likes Received:
    5
    lithium grease seems the best option, i'll get some over the weekend
     
  4. Alex9779

    Alex9779 Moderator
    Staff Member

    Joined:
    Sep 4, 2015
    Messages:
    2,405
    Likes Received:
    731
    But the multi-purpose one should be fine for initial greasing of the bearings if you wanna do that...
    Misumi recommends for its bearings to degrease them in an ultrasonic bath because they are delivered not in a real grease but a corrosion protection oil.
    So this can't be wrong even for the cheap Chinese bearings though we had reports where those bearings had loose balls which could be emphasized if you clean them in an ultrasonic bath.
    Then use a soap based lithium grease, which those multi-purpose greases are normally...
    For the Z axis lead screws I recommend the white lithium grease...
     
  5. RTBiscuit

    RTBiscuit Well-Known Member

    Joined:
    Jun 2, 2016
    Messages:
    62
    Likes Received:
    5
    i had a couple of ball bearings fall out as i assembled the z axis on 1 bearing. i'm guessing i will need to replace these bearings at some point, but for now at least it will get me started.
     
  6. Bluemalu

    Bluemalu Well-Known Member

    Joined:
    Mar 17, 2014
    Messages:
    95
    Likes Received:
    6
    @RTBiscuit, no need to visit the shops, according to the data sheets I could find on you Castrol Multi Purposes, it is the replacement for Castrol LM. The grease you have is high melting point lithium based grease. Misumi recommend LG2 by NSK but good luck finding some as it's rather specialist and expensive.
    As @Alex9779 says, the Parks or in my case Finish line grease is nice for the Z screw. The other factors for choosing your grease is how much dust there is around the printer and also the temperature, my printer is in a shed outside and on cold days one of the original bearings I filled with white lithium is decidedly sticky till it warms up and I'm having too much fun to replace it with the misumi sat waiting to replace it.
     
  7. RTBiscuit

    RTBiscuit Well-Known Member

    Joined:
    Jun 2, 2016
    Messages:
    62
    Likes Received:
    5
    I bought some lithium today, as the workshop is very warm and dusty decided the lithium is less likely to gunk.
     
  8. R Design

    R Design Well-Known Member

    Joined:
    Oct 7, 2015
    Messages:
    918
    Likes Received:
    183
    I now realise that the Lithium grease I bought on amazon.co.uk (TF2 all purpose) is entirely the wrong thing. It's made for bicycles and is like toothpaste that's halfway to being dry. That is probably damaging my Misumi Z-axis experience.

    20 mins of searching for an nsk lg2 source in Europe and so far all I find is this:

    https://www.aliexpress.com/item/NSK..._3&btsid=63086fd9-4e87-49a4-9fc3-5114d542d125

    Is there even a tiny chance it's the real thing / up to the job of the undemanding 3d printer application?

    If I can't find exactly the right thing then perhaps it's moving over to whatever oil-based grease Misumi recommends?

    Life is a battle against the ripples in the bands on the sides of parts and on my printer I reckon that's all about the coefficient of static friction: what it takes for the bed to start dropping when the lead screws are no longer holding it up.
     
  9. Stefan

    Stefan Well-Known Member

    Joined:
    Feb 17, 2016
    Messages:
    323
    Likes Received:
    43

Share This Page