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"Folded"

This is a discussion on "Folded" within the SIG Sauer Gunsmithing forums, part of the SIG Sauer Forum category; Folded Slide's Who(m)decided to reference Swiss/German breech block slides as Folded? I hate the word of reference since there is NOTHING Folded,Formed,Bent,Shaped in the slides ...


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Old 09-14-2020, 08:34 PM   #1
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"Folded"

Folded Slide's

Who(m)decided to reference Swiss/German breech block slides as Folded?

I hate the word of reference since there is NOTHING Folded,Formed,Bent,Shaped in the slides manufacturing process.

Broaching or shaping(shaving) was NOT an option for the Swiss or Germans since finish & repeatability is/was inconsistent.

The slides were MILLED from bar stock & chins were welded to the finished slide,then parkerized.

Look at the milling machine/cutter marks inside the slide after you remove the Bbl...walla...nothing Folded!
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Old 09-14-2020, 09:22 PM   #2
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Bear posted some pics a while back showing the slides being made and the machinery. I seem to remember it showing the main portion of the slide being folded over a form. I saved the pics at work. Maybe someone can post them again.

They definitely don’t look machined to me.

Last edited by bblr; 09-14-2020 at 09:25 PM.
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Old 09-15-2020, 02:39 AM   #3
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This thread has good info on the folded slides,

https://sigtalk.com/sig-sauer-pistol...ded-slide.html

They cut squares of sheet steel, pressed into shape and then weld the front section on. They were crudely made (compared to today’s capabilities) but that was a popular way of making guns back then, think AK47, G3/MP5 as well many others.
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Old 09-15-2020, 03:15 AM   #4
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Sure am happy to see the link back to the pictures that Bear originally posted. Fascinating. Would never have imagined that the nose was welded onto the end. I always assumed that only a part was welded under/inside.

Of course I had to pull one out to examine.

Last edited by TerminalSigness; 09-15-2020 at 03:17 AM.
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Old 09-15-2020, 04:24 AM   #5
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Quote:
Originally Posted by Twister View Post
This thread has good info on the folded slides,

https://sigtalk.com/sig-sauer-pistol...ded-slide.html
Thatís the thread I was talking about. Thanks.
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Old 09-15-2020, 06:00 AM   #6
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I like "folded".

It sounds much more caring than "bent".
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Old 09-15-2020, 07:19 AM   #7
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Dies, and Hydraulic Presses "form", as ThnkFrst says, "folded" seems more deliberate, than "bent" which sounds accidental.

Not much different than an AKM, except it uses rivets for assembly, and Sig used welding and tension pins to assemble the slide. Of course I've seen some AKM receivers that looked "bent" rather than die formed too...
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Old 09-15-2020, 07:37 AM   #8
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Quote:
Originally Posted by bblr View Post
Thatís the thread I was talking about. Thanks.
thankyou thankyouverymuch!!

milled slides:
not my pics!!
Attached Images
File Type: jpg Machined Slide.jpg (57.9 KB, 15 views)
File Type: jpg Machined Slide2.jpg (78.8 KB, 16 views)
File Type: jpg Machined Slide3.jpg (54.4 KB, 17 views)
File Type: jpg Machined Slide4.jpg (52.8 KB, 14 views)
File Type: jpg milled folded.jpg (34.7 KB, 14 views)
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Old 09-15-2020, 08:34 AM   #9
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Quote:
Originally Posted by bearone2 View Post
thankyou thankyouverymuch!!

milled slides:
not my pics!!
Looks like the "Internal Extractor" version... ala P220 ST
Attached Images
File Type: jpg Machined Slide4 (2)_LI.jpg (820.1 KB, 27 views)
File Type: jpg DSCN1768_LI.jpg (7.68 MB, 13 views)

Last edited by Willard; 09-15-2020 at 08:50 AM.
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Old 09-15-2020, 08:54 AM   #10
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I think the only things machined on the folded slides are the cocking serrations and the dovetails.

I guess the breechblock too.
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Old 09-15-2020, 11:39 AM   #11
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It also appears that they milled a flat spot for the barrel hood to slide against. The inside of the folds may have interfered with the flat corners of the hood.

I know what Iím doing tonight. Just gotta look.
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Old 09-15-2020, 02:41 PM   #12
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Quote:
Originally Posted by Willard View Post
Looks like the "Internal Extractor" version... ala P220 ST
Looks more like the SP2009.

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Old 09-15-2020, 03:05 PM   #13
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Quote:
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Looks more like the SP2009.

I believe you're right, I didn't check the "distance"!
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Old 09-15-2020, 03:12 PM   #14
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Quote:
Originally Posted by TerminalSigness View Post
It also appears that they milled a flat spot for the barrel hood to slide against.
I think that the triangular flat on the top of the slide is formed when the slide is "folded" (in my experiences it's a stamping). If you look closely at this pic taken after the chin and rear radii are welded but before machining ops, you can make out the flattened area.



I think you are right that it gives the barrel hood something flat to run on.
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Old 09-15-2020, 07:26 PM   #15
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Quote:
Originally Posted by TerminalSigness View Post
It also appears that they milled a flat spot for the barrel hood to slide against. The inside of the folds may have interfered with the flat corners of the hood.

I know what Iím doing tonight. Just gotta look.

Swiss/German to US English language translation at it's best!!

I removed the breech block out of 1 of my P220's.

The interior of the "Folded" slide is/was milled to remove the inside radius during the press FORMING operation.
Hence the end mill machine marks that are present.

"FORMED" would be the correct terminology....not Folded.
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