Cetme Demill

[turmanator]

Please don't belittle me:fight:

Since we have the Jig coming to us here in Houston very soon,
I thought I might go ahead and demill my Cetme. I've demilled
many AK's, so I have the theory down, but know little to nothing
about Cetme's. Anyone know of a demill tutorial, or can point me
in the right direction to have this thing ready?

[Otis61]

As you probly know the CETMEs were spot welded at the trunion and cocking tube. So you need to grind as much of those spots off without grinding into the metal underneath. Take a dremel with a cutting disc, and separate the trunion, and cocking tube. Then you can do the trunion first. Its easy. When thats done take the dremel and very carfully cut through just the layer of steel that was the reciever in a strait line flush with where the front of the reciever was. There are two laters of sheet metal there, and you want to leave the second layer in tact. After you make the cut you grind the spot welds. Theres usually 1 or 2 on each side, and three on the top. When your ready to take the unwanted piece off be carful not to twist or deform the cocking tube. Then just clean them up on a belt sander.

[IL DUCE]

Please don't belittle me:fight:

Since we have the Jig coming to us here in Houston very soon,
I thought I might go ahead and demill my Cetme.

Whats jig?

[turmanator]

The Cetme flat bending jig ...

[flemgunner]

I dont know if your a memeber or not (I guess you cant seethe pix if your not) but I have a demill tutorial (sort of) on the weapons guild site for the HK33. It should be about the same
http://www.prexis.com/sten/homebuilder/index.php?topic=1161.0

[turmanator]

I am a member and that is exactly wht I need...thanks...:thumbup:

[Lon Moer]

I haven't read flemgunner's link (yet, I am also a member there).
But, my recommendation on separating the cocking tube and trunnion, is to cut along the length vertically, this way any overcut will be into the top of the trunnion and not into the cocking tube.

[IL DUCE]

The Cetme flat bending jig ...

Grazie

[animator]

This is how I did mine.


I start by chocking up the cocking tube and trunion into a vice. Don't go too tight, otherwise you risk deforming your tube. Notice the plug welds, in addition to the weld where the tube meets the receiver.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010276.jpg


Using a dremel with a cutoff wheel, I cut down the length of the receiver, as shown.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010277.jpg


Flipped it over and did the same to the other side. You want to be careful and not cut too deep. There is a sleeve inside the receiver, and if you get too carried away, you will cut this sleeve.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010278.jpg


With those two cuts, the trunion drops away, and can be set aside.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010280.jpg


Next, I need to remove the excess scrap receiver still welded to the cocking tube. You want to be VERY careful while cutting this off. You can very easily cut into the cocking tube's sleeve, and ruin it. You also want to pay attention where you cut. If you cut your tube too short, you can potentially have issues with bolt-gap later on.


http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010285.jpg


I ground them down. You want to go slow here, and pay attention to the grinding tool. You can notice the metal seams as you break through the weld, so when you see the seams, stop, and begin to pry away the metal. On my kit, there were three plug welds on the side, and two on top.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010282.jpg


Now the cocking tube is off and can be set aside.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010287.jpg


To get the trunion out, you will have to grind as many as 6 plug welds. Once these welds are ground out, peel away the scrap receiver, and set your trunion aside.

http://i292.photobucket.com/albums/mm21/animator752/CETME-G3%20Build/P1010288.jpg

[Otis61]

Thats how I do mine too. On mine there were also spot welds at the top of the cocking tube as well.

[turmanator]

Started my demill. Trunion came right off.
My receiver has a bead weld along the end
attaching it to the cocking tube along with
the 5 spot welds. This seems to be normal
since I think I saw a post from someone else
saying they had the same thing?

[turmanator]

OK, how badly can I F up the demill on the cocking tube and still use it?
I kinda ground a hole small thru the inner layer. Boy it's hard to see when
you are through that first layer.....:icon_neutral:

[animator]

Depends on how big the hole is. If it's tiny, don't worry about it.


If it's a large hole, you may run into some issues when welding the tube to the receiver. You will definitely want to use some sort of backing for the welded area, otherwise you will definitely blow right through it.

[flemgunner]

When I removed mine I accidentally forgot one weld and made a hole. I just filed it so it was smooth and flush and welded in a different spot than where the hole is