Taking Apart A Slip Joint

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orvet
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Taking Apart A Slip Joint

Postby orvet » Wed Aug 22, 2007 7:21 pm

I often get asked; "How do you take a knife apart?"

I ran across these pics I took of me taking apart a Schrade Old Timer #61OT. Here are the pictures I took.

It should be noted that a Schrade with Swinden Key construction can be taken apart by cutting the rocker pin (the one in the middle of the handles), then giving the handles about a 5º turn counterclockwise. Then the sides will come right off.

If you are trying to take a knife apart without damaging the handles, then the method in the pictures will work, and will work on most slipjoints whether they have the Swinden Key or not..

I hope this is helpful,
Dale

Step 1- Position a heavy duty disposable razor blade between the blade & liner. If the knife is multi-bladed, place the razor blade as close to the center of the knife as possible. Be sure that the razor blade does not bite into the liner, but runs parallel between the liner & blade.

Step 2- Tap the rear bolster of the knife with a soft-faced hammer to avoid damaging the bolster.

Step 3- After cutting the first pin, continue on to cut the rocker pin. On this step I moved the knife to where it is suspended between the canvas Micarta faces of my vise, so that the sides of the knife can pass on either side of the razor blade, & the between the jaws of the vise.

Step 4- Continue tapping the razor through the last pin. Be careful and don't hit it too hard or pieces of knife can fly in all directions. Just tap lightly & the knife will fall apart.
Attachments
Cutting rivets 4.jpg
Step 4
Cutting rivets 3.jpg
Step 3
Cutting rivets 2.jpg
Step 2
Cutting rivets 1.jpg
Step 1
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Postby W5RWU » Mon Sep 17, 2007 2:12 am

Thanks Dale ::tu:: ::tu:: ::tu::
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Postby Sqg1 » Thu Oct 11, 2007 5:36 pm

I gave it a try, works great. Thanks, Dale

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Postby orvet » Thu Oct 11, 2007 6:22 pm

Let us know how it works for you. Also please show us what you make from the knife you take apart.

Dale
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Postby wildcat » Tue Jan 15, 2008 11:24 pm

Orvet, if you cut the center pin and the knife falls apart in your hands, can the knife be reassembled and a new center pin installed or do you have to do through pins?

in other words, can you reuse the existing Swinden keys?

Thanks.

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Postby Diligence » Wed Jan 16, 2008 1:51 am

http://www.allaboutpocketknives.com/kni ... p?id=19535

Wildcat - here is a photo of a small 3 blade Schrade, with the swinden keys intact. All I did was cut the center pin and I am working around the swinden keys.

cheers,
Jaye

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Postby wildcat » Wed Jan 16, 2008 12:36 pm

so it looks like as long as you don't take them off the blades you can prolly re-use them. correct?

is there a supplier of these?

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Postby Darksev » Wed Jan 16, 2008 1:47 pm

I've done a few swinden key knives (12ot's, 34ot's). It's a nice system if you can work around it.

If you cut out the "barbell" that goes through the blades, then your pretty much going to end up drilling out the bolsters for real pins. I've not found anywhere you can buy the barbells, they were most likely made in house for schrade with somewhat specialized equipment. The best answer for making them yourself I've seen is "have fun".

If you can work around the keys, leaving everything attached (and that's fun all by itself, 34ot is 3 blades, one spring and a brass center all connected together. it's a sliced finger waiting to happen) then all you need to do to put everything back together is replace the rocker pin you cut to get it apart.


Oh, and Dale's method of splitting a knife apart displayed here, top notch awesome. :mrgreen:

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Postby orvet » Wed Jan 16, 2008 4:16 pm

wildcat wrote:so it looks like as long as you don't take them off the blades you can prolly re-use them. correct?
is there a supplier of these?


As long as you don't cut the Swinden rivet you can use the whole inner assembly over again, as long as the tolerances are still right. If the blade had a bit of wobble to it, then you will have to cut the rivets & use the pin-through-bolster method.

If I am just putting new handles on a otherwise good knife, then I do reuse the Swinden assembly and it works great. All you have to do is replace the rocker (center) pin. But once you cut either of the Swinden rivets, you have to drill out both bolsters and convert it to pin-through-bolster.

According to the info I have, i.e. from LT, Schrade was the only company to use the Swinden Key system. Dave Swinden, who worked for them for many years & invented the system. IIRC, he is one of the principals of Canal Street Cutlery now.

LT has seen the equipment used in making knives with the Swinden Key knives. I guess it is very impressive. I can see how it would be an advantage in manufacturing on a large scale (as Schrade did) but it does not simplify the repair process, not unless you have the machinery to set them up. It was easy for Schrade because they had the equipment, but everyone else struggles with them.

Schrade made 2 or 3 patterns of slipjoints for Buck. Buck said, “These are great, excellent quality, but can you loose the Swinden Key so we can repair them in our factory?” Schrade said “No.” So Buck took those patterns to someone else to have them made, probably Camillus.

Darksev wrote:I've done a few swinden key knives (12ot's, 34ot's). It's a nice system if you can work around it.

Oh, and Dale's method of splitting a knife apart displayed here, top notch awesome. :mrgreen:


Thank you Darksev!
I am glad it worked for you.

To the best of my knowledge the only Swinden machinery was at Schrade. I don’t know where it is after the sale. The process is technical enough that I doubt anyone else would want to use it, without the system in place to manufacture the pieces necessary to assembly the knives. I can’t think of any American manufacturer (now days) who makes enough slipjoints to make the necessary investment profitable.

Dale
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Postby wildcat » Wed Jan 16, 2008 4:20 pm

thanks for the info. i'm in the process of redoing an old timer right now. i cut the swinden not knowing that was how it was made, so it will have to be pinned through the bolster now. ::dang::

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Re: Taking Apart A Slip Joint

Postby jonet143 » Fri Feb 20, 2009 11:59 pm

making a sticky so it can be referenced.
johnnie f 1949

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Re: Taking Apart A Slip Joint

Postby Rock3tman » Mon Mar 30, 2009 11:25 pm

Thank you very much! i have been tinkering around trying to figure out an easier way to take a knife apart, and this works just fine.
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Re:

Postby Jody744 » Mon May 04, 2009 3:48 pm

Diligence wrote:http://www.allaboutpocketknives.com/knife_forum/download.php?id=19535

Wildcat - here is a photo of a small 3 blade Schrade, with the swinden keys intact. All I did was cut the center pin and I am working around the swinden keys.

cheers,
Jaye


this link is no good... can it be re-posted???????? thanks
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Re: Re:

Postby orvet » Tue May 05, 2009 3:49 pm

Jody744 wrote:
Diligence wrote:http://www.allaboutpocketknives.com/knife_forum/download.php?id=19535

Wildcat - here is a photo of a small 3 blade Schrade, with the swinden keys intact. All I did was cut the center pin and I am working around the swinden keys.

cheers,
Jaye


this link is no good... can it be re-posted???????? thanks



Jody,
I think the pic was lost a while back in a server change.
I just spent an hour looking for it, but can't find it.

Sorry,
Dale
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Re: Taking Apart A Slip Joint

Postby Diligence » Thu May 07, 2009 1:28 am

I think this was the photo that I had posted.

Hope it helps.

Jaye
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