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Somethign for punkworks to test out.


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#1 `kook

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Posted 05 January 2009 - 01:01 AM

I noticed this weekend EVERY screw on my gun was backing out. I lost 3. Even the reg and back cap on my pmr was backing out and in the middle of the game air started shooting out the back.

My theory is since things shrink in the cold as they expand in heat they shrink in the cold and cant grab the threads.

So if anyone has a different reasoning as to why that happens, I say on punkworks they maybe put a gun in the fridge for an hour, take it out and shoot it (staying in the cold of course) and see if screws start to back out on their own.
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#2 Lord Odin

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Posted 05 January 2009 - 01:03 AM

Since most materials shrink in colder weather, the body probably makes the holes bigger and the bolts become smaller, which would put less tension on the threads.

I'd let the gun acclimate to the temps and then tighten everything up again or just put some teflon tape on them.

#3 Leftystrikesback

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Posted 05 January 2009 - 02:31 AM

It's most likely because different materials shrink in different proportions in the cold. When a material with a hole in it shrinks, the hole shrinks too, but the steel bolts shrink a different amount than the aluminum hole they are in. Even different alloys of aluminum shrink differently. The property is called coefficient of thermal expansion and it is different for every material. If everything shrank the same amount and at the same rate, you wouldn't have any problems, but that's not the case and the difference can cause threads to loosen (or tighten).

Edited by Leftystrikesback, 05 January 2009 - 02:32 AM.

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#4 Troy

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Posted 05 January 2009 - 09:34 AM

The blue loctite works wonders... if you don't like screws backing out, its perfect, and a lot easier to use then teflon tape (which has obvious other purposes).
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#5 GrenadeMaster

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Posted 05 January 2009 - 09:11 PM

teflon tape (which has obvious other purposes).


Making bullets go through stuff better?

I usually put it around my paintballs for armor piercing rounds when those pesky tanks get in my way...


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On topic this ALWAYS happened with my ion... that back screw would always come undone. It has to do with the vibration of the gun, and the tolerances allowed...

Notice on MOST higher end guns, the screws don't back out very much. The tolerances are much tighter, thus the higher quality, and therefore a hefty price tag.
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#6 sibleywibbley

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Posted 06 January 2009 - 11:24 PM

It's most likely because different materials shrink in different proportions in the cold. When a material with a hole in it shrinks, the hole shrinks too, but the steel bolts shrink a different amount than the aluminum hole they are in. Even different alloys of aluminum shrink differently. The property is called coefficient of thermal expansion and it is different for every material. If everything shrank the same amount and at the same rate, you wouldn't have any problems, but that's not the case and the difference can cause threads to loosen (or tighten).



the screws are steel and the frame of most guns are aluminum, this may have an effect?
in colder weather things tend to harden, oil for example. it is the same thing with the screwa ans they bounce more in the threads of the gun on top of the heat expansion/cold shrinkage. as far as i know i thinkk that is a good idea of whats going on.

for an experiment, there needs to be a controll on how tight the screws are on the marker. say, tie a bit of twine to the end of an allen key, and pull till it snaps, then fire so many times.

same for the cold test, but still tighten the screws at room temp.

Edited by sibleywibbley, 06 January 2009 - 11:33 PM.

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#7 A.E.D.paintballer

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Posted 07 January 2009 - 07:01 PM

or tight screws when marker is cold then see if they are ultra tight at normal temp
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