Dry fire.

P

popcanhunter

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So I grabbed that pietta pps 50.

I hate the idea of leaving springs under pressure, for fear of weakening them.

Should I dry fire after a session, or store the hammer spring cocked?

Does leaving magazines full eventually result in failure to feed?
 
Springs weaken from cycling, they do not weaken from being stored compressed.

I don't like to dry fire rim fire guns, but that said, it is perfectly fine in many modern designs although I'm not sure about the pps50 in particular. You may be able to decock it by riding the bolt closed as you pull the trigger, then again maybe not. I store all my firearms with their actions open so this a non issue for me.
 
Kody said:
Canadian_Zuk said:
Springs weaken from cycling, they do not weaken from being stored compressed.

Yup, that's what they teach you in a mechanical engineering class.
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Awesome!

So when my ranger was overloaded for 3 weeks it wasn't weakening the springs overnight? And putting the trailers tongue jack down to relieve pressure while i slept actually did the truck a disservice?
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Different types of springs.
I put air bags under the rear suspension of my truck to keep the camper
from sqwarshing the rear suspension.
I'm talking about an F-350 PSD and a camper that weighs just under 3000 pounds dry.
 
If a coil spring such as we see in our guns collapses from being left compressed then it was either chosen incorrectly for the job or is made from a poor quality wire.

Same with leaf springs on the truck. I strongly suspect that the old stories about leaf springs taking a set if left bent for too long are cover ups for poor quality spring work.

The other odd thing is that a spring will not generally become soft from cycling. Instead the wire work hardens and becomes brittle. So the more typical failure mode is that the spring gets harder over time and finally snaps from the cycling. But again if the spring is chosen well for the application it stays away from the limits so well that in many cases we won't even see this extreme.
 
popcanhunter said:
Kody said:
Awesome!

So when my ranger was overloaded for 3 weeks it wasn't weakening the springs overnight? And putting the trailers tongue jack down to relieve pressure while i slept actually did the truck a disservice?
Click to expand...

Nope. It just caused you more work.

Do some reading about the Youngs Modulus .

Essentially a steel spring remains sound until you exert a stress on it beyond what is needed to permanently bend it. If you stay within it's design load range, it will stay as good as it ever was. So...overloaded? Overloaded may be a problem, but the damage is done by the overload, not prevented by taking up the load while at rest.

Cheers
Trev
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This is a rarity: a CGN thread that was completely worth reading, for more than just entertainment value. Very interesting info.

You learn something new every day...and at my age, I'm getting kinda sick of it! :)
 
It is a good thread, I learned a couple things about springs. I would have thought being compressed for long periods was worse than no compression.
 
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