Author Topic: Tuning trigger springs  (Read 5705 times)

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Alabama

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Tuning trigger springs
« on: January 08, 2008, 11:01:55 AM »
Awesome. A great place for trigger job questions. Thanks, Kivaari, and Galahad, for this new section.

Q: WTF is spring tuning? I've searched the web and have an idea it's got something to do with removing coils to reduce resistance but I'm still pretty confused. If I get a Wolff set I'm still only down from 36 lbs to 26 or so, but I'd love about 6. I'd love to know how this is done.

Folo-up: Will original springs tune, or does the steel fatigue after years of arsenal storage and sitting in my closet?

Thanks for the info, SKS'ers, and for the nice addition (seems like a great place to put all the trigger function questions, observations, etc.)
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Kivaari

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Re: Tuning trigger springs
« Reply #1 on: January 08, 2008, 06:17:20 PM »
Ok....I'm not real sure how to respnd..exactly...so:

Spring tuning in general would be modifying the spring for less strength assuming a given free length. The free length is the spring at rest and not under load. So the correct way to do this on a coil spring, that has the needed free length for the function at hand, is to reduce the diameter of the spring's wires by "turning" or "spinning". To spin a spring, you support the spring on an axis somehow and use friction against an abrasive, like a sanding wheel or belt. This takes some skill to uniformly reduce the diameter of the wound wire over the entire length of the spring. Removing coils shortens the free length and the distance you have to compress the spring for a given strength. Power of springs has to do with the diameter of the wound wire, overall diameter of the spring, free length, and the number of coils.

A pretty good rudimentary explanation of springs, in general, is on Wolff's FAQ page on their website: www.gunsprings.com. You do not want to weaken the hammer spring in the SKS any more for reliable ignition of your ammo's primers.

I infer by your reference to "6 pounds", etc. that you're likely talking about trigger pull weight. If so, it is a function in the sks of the kind/magnitude of engagement of the hammer and sear, sear spring, and to a small degree the hammer spring.

If the steel is fatigued, the spring in question is toast. The best springs today are chrome silicon.

« Last Edit: January 08, 2008, 06:33:38 PM by Kivaari »
kivaari
quality and correctly engaging SKS trigger tune

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Re: Tuning trigger springs
« Reply #2 on: January 08, 2008, 08:07:27 PM »
Great info, though disappointing to find I probably can't tune my own trigger springs. Maybe with lots of practice, but probably not a great idea. If I'm following, though, correctly applying the Fragger trigger job should affect the hammer/sear engagement to some extent and allow for a lighter trigger pull, right?
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Kivaari

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Re: Tuning trigger springs
« Reply #3 on: January 08, 2008, 09:51:33 PM »
Fragger is describing how he would install a new sear and make it work. Hard to say anything else about the result from the information given..

So...to answer your question...maybe or maybe not.

« Last Edit: January 08, 2008, 09:55:56 PM by Kivaari »
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quality and correctly engaging SKS trigger tune

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JohnClark7886

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Re: Tuning trigger springs
« Reply #4 on: May 02, 2008, 02:05:11 PM »
Kivaari, I have a question.  I recently had my trigger done and he installed the wolf springs.  However I still feel it is harder to pull than I thought it would be.  I see your rates, however do you knock off anything if you already have a brand new set of wolf springs on the trigger group.  I think they cost me around $10.00.   Thanks....

Kivaari

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Re: Tuning trigger springs
« Reply #5 on: May 03, 2008, 12:15:30 AM »
Sure, I'll reduce the price by my wholesale cost for the spring set.

Give me a call: 972-965-1120
kivaari
quality and correctly engaging SKS trigger tune

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JohnClark7886

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Re: Tuning trigger springs
« Reply #6 on: May 06, 2008, 11:41:25 AM »
Typically what is the pull weight you get on a trigger assy after you have fixed it.  Mine seems awfully hard to pull.  When the gunsmith finishes working on what I have him doing right now, I am going to have him measure the trigger pull weight.  I want to get an idea on what your modification will reduce it to from what it is now.  It sure seems like I have to almost jerk it to pull it back.  Let one of the guys I work with shoot a few rounds and he handed it back and said no thanks, trigger to hard to pull. 

Kivaari

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Re: Tuning trigger springs
« Reply #7 on: May 07, 2008, 11:34:28 PM »
4-41/2# with greatly reduced creep if the hammer and sear are in good condition and not butchered by the factory or someone else since. In other words, occasionally a new sear is in order. Rarely the hammer is toast.



« Last Edit: May 07, 2008, 11:40:23 PM by Kivaari »
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quality and correctly engaging SKS trigger tune

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