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Old 07-05-2019, 9:25 PM
nn21 nn21 is online now
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Default Torsion Spring Making

So I managed to break the hammer reset spring on my sig p232 today. Normally not a big deal except P23X parts, especially that spring, are pretty much nonexistent.

Given the lack of availability, it seems I have three options: Have a small run of springs made from a low volume spring company, try to find someone out there with a hoard of parts somewhere, or make the spring myself. Obviously its a balancing game of money/time/labor. Working with sheet stock spring steel isn't very daunting to me. Forming a small gauge torsion spring is a little out of my comfort zone. The heat treat process doesnt bother me. The coil and leg forming is what I'm thinking will be the real challenge from a home shop.

Curious if any of the gunsmithing guys have any experience making replacement torsion springs.
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Old 07-05-2019, 9:46 PM
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Originally Posted by nn21 View Post
So I managed to break the hammer reset spring on my sig p232 today. Normally not a big deal except P23X parts, especially that spring, are pretty much nonexistent.

Given the lack of availability, it seems I have three options: Have a small run of springs made from a low volume spring company, try to find someone out there with a hoard of parts somewhere, or make the spring myself. Obviously its a balancing game of money/time/labor. Working with sheet stock spring steel isn't very daunting to me. Forming a small gauge torsion spring is a little out of my comfort zone. The heat treat process doesnt bother me. The coil and leg forming is what I'm thinking will be the real challenge from a home shop.

Curious if any of the gunsmithing guys have any experience making replacement torsion springs.
I have made a few or more springs. Get some spring stock from Brownells and some wire looping pliers. If you are not trying to crank out a bunch of them, it will do just fine.

I am not sure what the coil diameter is, but you could also use a steel/aluminum dowel of the right size if it is too large for spring pliers.

Step one is blueprint. You need the wire gauge, the leg lengths, and coil inside diameter. If you have your broken part that should be easy.

Step two is form the coil around a dowel or mandrel, with the legs going approximately in direction you need them. Don’t worry about leg length, use a 6 or 8 inch length of spring stock and form the coil in the middle. You will have plenty of handle this way to work with. You may need a slightly undersize form to account for spring back. This is where a cone mandrel or pliers come in handy.

Step three is trim the legs to length then make the little 90 bend.

Then heat and temper.

Is this the spring? Looks easy enough to try, almost couldn’t get easier for a beginner spring project.

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Last edited by SkyHawk; 07-05-2019 at 10:04 PM..
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Old 07-05-2019, 10:00 PM
nn21 nn21 is online now
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Originally Posted by SkyHawk View Post

Step one is blueprint. You need the wire gauge, the leg lengths, and coil diameter. If you have your broken part that should be easy.


Is this the spring? Looks easy.
That's the spring. Although mine has a significantly smaller free angle than that picture shows. Already put together a drawing to get a quote to make a number of them.
The main concern I have is how accurately I can get the angle/how flat I can keep the coil and what a variance in those values will do to function.
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Old 07-05-2019, 10:10 PM
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Keep in mind your old spring may have less angle at rest, from years of use / set. You may want to put in a bit more angle to account for this.

The angle at rest is less critical than the coil ID, and how important the flatness of the coil is depends on the clearance between parts where it is used. Typically you want it very flat. You can usually get a pretty flat coil by hand with some practice. Having spring winding pliers helps.


PS - I got that pic above from Midway.
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Last edited by SkyHawk; 07-05-2019 at 10:16 PM..
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Old 07-05-2019, 10:22 PM
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I'll give it a try. Material is cheap enough that its a easy hit if I fail at it. Thanks for the insight.
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Old 07-06-2019, 5:29 AM
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Brownells has a music wire kit that will probably do you just fine. No need to heat treat the little ones like yours, just cold bend them and put them to work.
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Old 07-06-2019, 9:50 AM
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That looks like a really easy spring to make by hand.
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Old 07-06-2019, 7:44 PM
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I made a spring from your blueprint, you can come grab it in Rocklin if you want to try it or could try mailing but it may get crushed since I put the 90 degree bend in.

I left the straight leg long for you to clip and the dog leg section just a tad long for you to clip.

This is ~23ga spring wire from Brownells stock, no heat or temper just a cold bend. I also went more by the pic I found for the angle (maybe 80 degrees), so it can take a set and still give the positive action you need.

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Last edited by SkyHawk; 07-06-2019 at 8:26 PM..
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Old 07-06-2019, 7:53 PM
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Yeah, you got this. Get some music wire in the proper diameter. Let Amazon be your friend. Make sure you get STRAIGHT pieces and not a coil. Do NOT cut it to length before you wind it around a mandrel. The mandrel will have to be a smaller diameter than the spring needs to be--because it will spring back. You'll have to experiment.

Sometimes when you try to bend a 90, you'll break the material. Heating to dull red can help here.

Buy a dozen lengths of material, then you can make many dozens of prototypes before you get one that you like. It will be cheap, and you'll get to become the pro who makes springs for his gun.
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Old 07-07-2019, 12:45 AM
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You don't need to heat treat it after it's bent to hold the bend?

I made a few springs and hardened them by mapp/oil quench. Of course, my failure rate is probably 40-50% 😏
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Old 07-07-2019, 5:48 AM
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Quote:
Originally Posted by saki302 View Post
You don't need to heat treat it after it's bent to hold the bend?
Not necessarily. I'm no metallurgist, so I can't tell you which alloys will perform which way. My most recent spring-steel projects have performed perfectly since heating them to make tight bends.

Material is cheap, so it doesn't matter how many get goofed up in the process of learning.
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Old 07-07-2019, 6:15 AM
Dano3467 Dano3467 is offline
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That looks like a pretty easy one to make. Lots of springs at ACE, you can get pretty close then finish.

Did one for a sig P232, slide lock spring, little more complicated, but after a few trial & errors, it fits & works like original part

You can do it !
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Old 07-07-2019, 5:49 PM
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Thanks for all the insight, everyone and special thanks to Skyhawk for going out of his way to make the spring. I ordered some material but even amazon prime isn't as fast as Skyhawk. I met up with him today and, after a little fitting, the gun is back in working order. I have the material now and I think I'm still going to try and make some spares myself. The skill alone will be valuable to have.
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