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» Trap Line Community Bulletin Board » Trap Line Archives » Traps & Equipment Archives » Coilspring strength

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Author Topic: Coilspring strength
Butch1987
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Is there a large difference in spring strength from a #1 3/4 and a #2 coil spring?
Posts: 42 | From: Deleware | Registered: Dec 2008  |  IP: Logged | Report this post to a Moderator
Ric
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I'm going to give a qualified No as the answer.If the manufacturer offers both sizes the springs will be similar.Between manufacturers you will see some difference.I don't know of anything currently available that have springs unsuitable for the trap size they are installed on.
I tested a bunch of different springs once.My findings were that there is not a great deal of difference between spring X and spring Y.Given the same wire diameter and # of coils.The perception of spring strength caused by the lever design can be significant.

Posts: 3438 | From: Wellington,OH=USA | Registered: Jul 2000  |  IP: Logged | Report this post to a Moderator
haf2sell
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Ric-

Pardon the stray. Wouldn't some form of "pressure" test between the jaws be a better method of matching springs to a task (trap)? Curious more than anything. (And yes, the times I have replaced them, I used "stock" from the mfg. for the size needed.)

Thanks in advance.

Posts: 468 | From: SW Michigan | Registered: Jan 2008  |  IP: Logged | Report this post to a Moderator
Ric
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Actually I would rather know the psi(force) exerted by the jaw faces.This would take into consideration the actual design of the trap.I know what I need to do it but getting the time to build and calibrate it is a different matter
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haf2sell
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Thanks Ric. That's what I was thinking, but using different terms [Smile]

The other interesting aspect would be psi at different closure distances. I'm not a mathmetician so I'll leave that/these projects to another [Big Grin]

Posts: 468 | From: SW Michigan | Registered: Jan 2008  |  IP: Logged | Report this post to a Moderator
Butch1987
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Thanks that clears it up alot. I was just wondering if I were to put #2 springs on a 1 3/4 trap if would increase the speed of the jaws closing instead of four coiling but it seems that four coiling is the way to go.
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gryhkl
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The bridger 1 1/2 traps I bought last season seem to have much weeker springs than the 15+ years old montgomery 1 1/2 traps I've been using for years. I've held coon in these bridgers but I don't think they'd hold a coyote like the Montgomerys have.
Does anyone know if there would be much benifit in replacing these springs?

Posts: 37 | From: pa | Registered: Jan 2009  |  IP: Logged | Report this post to a Moderator
Ric
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Before you get carried away Butch.Check out the modification threads in the archives.Once you start down that modification path.There are often unexpected results.
Your traps will function just fine with 2 springs in 98% of situations.
The use of a spring made from music wire will often give you what you want and avoid all the problems you may encounter if you start changeing things too much.

GRYHKL..No,the traps are fine for the animals they are intended for

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Hal
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"The bridger 1 1/2 traps I bought last season seem to have much weeker springs than the 15+ years old montgomery 1 1/2 traps I've been using for years."

As Ric said: "The perception of spring strength caused by the lever design can be significant."

Hal

Posts: 8937 | From: Blue Creek, Ohio, USA | Registered: Jul 2000  |  IP: Logged | Report this post to a Moderator
Butch1987
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Thanks for the follow up
Posts: 42 | From: Deleware | Registered: Dec 2008  |  IP: Logged | Report this post to a Moderator
Otterwater0566
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Apparently this concerns you so just 4 coil them the modification is simple and easly changed "back" if you get too much power. The traps seem more balanced and easier for me to bed properly. I like 4 coils. I have had no weak bridgers. I use several Mont's and Northwoods because I have them and they do fine even w/stock 2 coils.
Posts: 440 | From: Austin, AR | Registered: Feb 2004  |  IP: Logged | Report this post to a Moderator
OutdoorsJake
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You know, I definately noticed the difference when I bought some Bridgers, Sleepy Creeks and Victors. All good traps but it did feel as though the Bridgers had a softer spring so I was wondering about this. I suppose Ric and Hal could have something there with regards to the lever design perhaps making it "seem" weaker but just handier to open up the trap. The levers do seem larger so I can see that being the case.
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Gage Drift
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I bought a Montana #3 about 2 years ago as a sample to look at. It seemed like a good trap so I bought more last Fall. I compared them yeaterday, and the one bought earlier seems weaker. I don't have a scale to measure the difference. None of these traps have been used yet. Does anyone know if they changed spring types?

How long a shelf life should I expect installed coilsprings to have?

Posts: 55 | From: Nevada | Registered: Aug 2003  |  IP: Logged | Report this post to a Moderator
   

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