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  1. #1
    Join Date
    Feb 2021
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    Lincolnshire
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    53
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    9

    Smile I need a sticky thread!

    Hi folks.

    I'm working on a couple of machinist jacks which are pretty specific to a single job, but I may be able to use them again. They're only simple aluminium rod, threaded with a stainless bolt with the head pressed into another bit of aluminium rod. As I said these are for one specific job, they don't have to last.

    The issue is, with all small jacks I guess, vibrations move the bolt and you lose your support.

    So, what can you ladies and gents suggest for making my threads sticky? I don't want a lock tight, I need to be able to adjust them, but don't want them flopping around.

    On a couple of smaller tests I've tried some thick way oil, basic grease, copper grease, all with varying degrees of failure. I have some no-slip-belt spray somewhere, but I can't find it, that was going to be my next trial.

    Suggestions?
    Many thanks.

  2. #2
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    59
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    6,540

    Default

    Try drilling a shallow hole in the thread, of a diameter to take a small piece of line trimmer cord (or 3D printer filament). Put a small piece of line in and that will provide friction to partly lock things up - bit like a nylock nut.

    Michael

  3. #3
    Join Date
    Sep 2009
    Location
    Newcastle
    Posts
    341

    Default

    Room for a locking nut?

  4. #4
    Join Date
    Jun 2005
    Location
    Townsville, Tropical Nth Qld.
    Posts
    225

    Default

    Could you use some thin knurled locking discs on the stainless thread?
    Crocy.

  5. #5
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    I saw a grubscrew that had a shallow slot made along its length, with a plastic strip inserted.

    Also, nylon patched fasteners seem to be getting popular.
    https://www.ndindustries.com/product...king/nd-patch/

  6. #6
    Join Date
    Feb 2018
    Location
    Loxton
    Age
    54
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    37

    Default

    Can you incorporate a nyloc into your design?

    Cheers Andrew

  7. #7
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    I know you said that you dont want to use loctite but i thought that i would mention loctite 222, its application is to retain adjustment screws from vibrating out of adjustment and it stays softish so that readjustment is not a problem. They say up to 1/4" but i am pretty sure it still works on larger bolts and might be an easy fix for your problem.

    https://www.henkel-adhesives.com/au/...ctite_222.html

  8. #8
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    1,656

    Default

    Could you slightly crimp the female thread section

  9. #9
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
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    1,536

    Default

    A drop of superglue once in place. Bit of heat to break it when you’re done.

    Thread sealing tape will also bind the threads in a non permanent manner

  10. #10
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    I'm not exactly clear what you are trying to do, but damping grease could be called sticky.

    https://www.youtube.com/watch?v=59F9qUDNwnQ

  11. #11
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
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    2,651

    Default

    Couple of ideas:
    - roll an O-ring down the threads so it sits in the thread and up against the part it screws into
    - a small cable tie tightened on the bolt thread/shank
    - loctite pipe sealant or aviation gasket sealant (Permatex #3) are non-setting sealants that meet the "sticky" criteria

    Steve

  12. #12
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
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    Perth
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    7,182

    Default

    Quote Originally Posted by Stustoys View Post
    I'm not exactly clear what you are trying to do, but damping grease could be called sticky.

    https://www.youtube.com/watch?v=59F9qUDNwnQ
    I've used lanotec grease in this matter in a lo/no vibe application.

  13. #13
    Join Date
    May 2008
    Location
    Perth
    Posts
    241

    Default

    I'm just going to parrot what racingtadpole suggested with using thread sealing tape, cheap to test, just possibly a real bugger to clean away at the end.
    Could also try the thread sealing string I've seen on the shelf at the big green shed, never used it myself but I imagine it does a reasonable job of tightening up a thread.

  14. #14
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    Default

    Here's one I prepared earlier (for those who could not understand what I was going on about)
    IMG_0756.JPG
    This is a 3D printed thread that I needed to keep a metal nut on firmly, without preventing rotation.
    Michael

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