Page 1 of 2 12 LastLast
Results 1 to 15 of 23

Thread: Needle Bearings On The End of the Spring?

  1. #1
    Hsing-ee's Avatar
    Hsing-ee is offline may also be employed in conjunction with a drawn reciprocation dingle arm, to reduce sinusoidal repleneration
    Join Date
    Dec 2001
    Location
    Glasgow
    Posts
    18,664

    Needle Bearings On The End of the Spring?

    Is this still a thing? I'm sure I have a packet of them in the parts boxes somewhere...

  2. #2
    Join Date
    Apr 2012
    Location
    Retford, Notts
    Posts
    37,287
    Not sure if anyone still goes down this route, Al. It is something I always fancied trying but never got round to. Many would say that using the polished steel washers that we tend to use anyway (or a combination of these and synthetic ones), to give a plain bearing work just as well and will prove more durable / reliable?
    THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
    NEXT EVENT :- May 17/18, 2025.........BOING!!

  3. #3
    Join Date
    May 2021
    Location
    Basingstoke
    Posts
    61
    yeah i wondered a bout these some time ago
    spose it depends if the springs turn as a norm ?
    ive also wondered if you have a load of washers
    at the guide end to get a plastic bush turned
    instead it would certainly look better
    Last edited by pellet sniper; 17-03-2024 at 06:11 AM.

  4. #4
    Join Date
    Oct 2004
    Location
    Nuneaton, Warwickshire
    Posts
    6,816

    Bearing Surface Brinelling.

    Always a chance this happening with bearings under load.


    Brinelling /ˈbrɪnəlɪŋ/ is the permanent indentation of a hard surface. It is named after the Brinell scale of hardness, in which a small ball is pushed against a hard surface at a preset level of force, and the depth and diameter of the mark indicates the Brinell hardness of the surface. Brinelling is permanent plastic deformation of a surface, and usually occurs while two surfaces in contact are stationary (such as rolling elements and the raceway of a bearings) and the material yield strength has been exceeded.
    Brinelling is undesirable, as the parts often mate with other parts in very close proximity. The very small indentations can quickly lead to improper operation, such as chattering or excess vibration, which in turn can accelerate other forms of wear, such as spalling and ultimately, failure of the bearing.


    Neil
    Current airguns:- Steyr LG110: Steyr LP10: Air Arms HFT500: Weihrauch97 fully customised.

  5. #5
    Join Date
    Aug 2016
    Location
    Melton Mowbray
    Posts
    2,314
    I have some thrust bearings both ball and roller, I have often considered trying this in a top hat.

    One thought I had if the spring becomes slack under recoil, the bits may fall out of the bearing.
    Repariere nicht, was nicht kaputtist.

  6. #6
    Join Date
    Apr 2002
    Location
    Near Wimbledon, SW London, or Lusaka, Zambia
    Posts
    26,987
    I did try it, and it does "work", but I couldn't detect any advantage over just a couple of hard steel slip washers and a dab of moly... on the downside however, their physical constraint mean they are tricky to fit to many smaller clylinder bore guns, plus there are the concerns about long term reliability.
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.

  7. #7
    Join Date
    Dec 2011
    Location
    coventry
    Posts
    1,819
    And spring room .

  8. #8
    Join Date
    Dec 2010
    Location
    Halesworth
    Posts
    431
    Airmasters were fitting these in the 1980’s, I have a few of their tuned HW77’s rifles with them fitted
    Last edited by Rikard; 17-03-2024 at 08:24 AM.

  9. #9
    Join Date
    Oct 2020
    Location
    Eastwood
    Posts
    1,716
    How would a ptfe washer sandwiched between two steel washers fare?
    The more I think I know, the more I realise the less I know.

  10. #10
    Join Date
    Mar 2008
    Location
    Rochdale
    Posts
    2,304
    I've just bought a txsr with one of these bearings fitted between the rear guide and the trigger block. It does shoot very well. Would it be advisable to remove it?

  11. #11
    Born Again is online now Owns three Roy orbison albums
    Join Date
    Jun 2020
    Location
    Cardigan
    Posts
    1,598
    Quote Originally Posted by Dornfelderliebe View Post
    How would a ptfe washer sandwiched between two steel washers fare?
    You'd be better with two PTFE washers between two steel washers. The coefficient of friction of PTFE on PTFE is similar to ice on ice.

  12. #12
    Join Date
    Oct 2020
    Location
    Eastwood
    Posts
    1,716
    Quote Originally Posted by Born Again View Post
    You'd be better with two PTFE washers between two steel washers. The coefficient of friction of PTFE on PTFE is similar to ice on ice.
    Thanks. I shall now try to find some on my favourite auction site. I'm sure that the ptfe will be protected by the steel.
    The more I think I know, the more I realise the less I know.

  13. #13
    Join Date
    Dec 2011
    Location
    coventry
    Posts
    1,819
    PTFE deforms and migrated , so you will probably see velocity varying , delrin is probably better.
    Your piston rotates in the tx anyhow, just make sure your piston weight/ top hat isn't stuck and grease it .

  14. #14
    Join Date
    Oct 2020
    Location
    Eastwood
    Posts
    1,716
    I have noticed, admittedly in my budget guns that the rotation has been pushed back (layman's terms) to the rear of the spring guide vs the end block.
    I saw this most visibly in my Paratrooper even though it's spring guide allows rotation there is a shiney circle worn into the rear block corresponding to a similar circle of the rear of the spring guide.

    It just goes to show how important a good spring bearing set up is.
    The more I think I know, the more I realise the less I know.

  15. #15
    Join Date
    Apr 2002
    Location
    Near Wimbledon, SW London, or Lusaka, Zambia
    Posts
    26,987
    Quote Originally Posted by NickG View Post
    And spring room .
    true....
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •