Electronics > Projects, Designs, and Technical Stuff
Serial port lock nuts always coming loose
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cs.dk:

--- Quote from: coppercone2 on October 17, 2019, 07:15:32 am ---nord lock washers on a computer part will make someone have a heart attack

--- End quote ---
I know that's not a job for Nord-lock. I just replied to the "a pair of nuts locked against each other" - Which won't work on a serial port either.

In my previous work we used Nord-lock for the knives in wood chippers. You don't wanna knife to come loose in there!

I don't think the bolts are lubricated makes much difference.
Electro Detective:

--- Quote from: boffin on October 16, 2019, 09:28:44 pm ---
--- Quote from: dom0 on October 15, 2019, 11:35:50 pm ---Loctite

--- End quote ---

or, just as effective, a bottle of nail polish.  Just dab the thread before putting it in. Just enough stick to stop them from coming loose,

and cheap cheap cheap

--- End quote ---

Beat me to it  :-+

boffin:

--- Quote from: Electro Detective on October 17, 2019, 08:44:32 pm ---
--- Quote from: boffin on October 16, 2019, 09:28:44 pm ---
--- Quote from: dom0 on October 15, 2019, 11:35:50 pm ---Loctite

--- End quote ---

or, just as effective, a bottle of nail polish.  Just dab the thread before putting it in. Just enough stick to stop them from coming loose,

and cheap cheap cheap

--- End quote ---

Beat me to it  :-+

--- End quote ---

I once went to the discount store, bought a $1 bottle of nail polish (with handy brush applicator too) in the ugliest colour I could find (bright orange), and my girlfriend at the time still pinched it from my workbench. <sigh>

now I just grab a bottle of my wife's polish from the bathroom when she isn't looking.

DBecker:

--- Quote from: cs.dk on October 17, 2019, 06:26:47 am ---
--- Quote from: magic on October 16, 2019, 05:39:35 pm ---One thing which will never be retracted for screw locking because it works:

a pair of nuts locked against each other :)

--- End quote ---

Nord-Lock does not agree. See this vibration test; The clamping force goes down pretty quick.



--- End quote ---

Nice video. Great production values.  I'm almost convinced.  But what's going on 2:08?  How did that upper lock nut spin less than the lower nut?  Was there an optical illusion?  Was the lock nut collapsing?  Doesn't that indicate incorrect assembly torque?

tautech:

--- Quote from: DBecker on October 18, 2019, 01:10:22 am ---But what's going on 2:08?  How did that upper lock nut spin less than the lower nut?  Was there an optical illusion?  Was the lock nut collapsing?  Doesn't that indicate incorrect assembly torque?

--- End quote ---
Think about it. When one nut is torqued onto another the bottom nut is effectively loosened in that its threads no longer bear upon the bolt thread with the same force as the lock nut is forcing it forward off the threads.

I've found that when using lock nuts you need go back and tighten the lower nut with an open end spanner and then hold it while you bring the top nut tight on it again. It's all a bit of a science getting the best from fasteners.
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