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Thread: Steel Copper Steel Sandwich???

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    Senior Veteran Smokehouse69's Avatar
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    Steel Copper Steel Sandwich???

    I came across something interesting this afternoon, I am converting a G3 stock endcap into a endcap for an HK53 clone I am building. I was cleaning up some of my cuts with a dremel sanding wheel and while polishing up the back edge, I saw a thin band of copper between the steel on the edge.
    Sorry about the crappy quality of the pic, it was done with my scanner, since I still haven't found my camera cable.
    Anybody ever seen anything like this before?
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    Senior Veteran rpmfly2's Avatar
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    I have never seen anything like that but

    from an engineering stand point laminated materials are several times stronger than any solid!
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    I have seen some samples of the progressive stampings that form these pieces for HK rifles at the museum in Orbendorf, and I did not see any evidence of a layered material being used.
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    Senior Veteran Smokehouse69's Avatar
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    I know it's strange and hard to see in that scan, but I swear that there is a thin copper colored line between silver of the polished steel that runs completely around the endcap.

    I blew up the original pic and cropped a section where it showed the best.
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    Senior Veteran cfish's Avatar
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    What was used to cut that piece. Any chance that it is rubbed off from the cutting tool??


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    Senior Veteran weasel_master's Avatar
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    Put it in amonia, if it's copper, it will turn the solution blue/green.
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    Senior Veteran Smokehouse69's Avatar
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    Quote Originally Posted by cfish View Post
    What was used to cut that piece. Any chance that it is rubbed off from the cutting tool??
    It wasn't cut off anything, that is the end cap from one of the G3 stocks from CTD. I pulled the plastic stock off and removed the recoil rod and spring. The edge I'm showing is the edge where the stock is meets the metal.
    After prying off the plastic stock I sanded the edge with a Dremel flapper sanding wheel prior to welding a metal plate across the back. I am making this an endcap for HK33 pistol build.
    Last edited by Smokehouse69; 03-30-2009 at 10:46 PM. Reason: add info
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    Senior Veteran bladeworks123's Avatar
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    I know from a friend who does progressive stamping of parts in the aerospace industry, that sometimes the pieces they use are two or three layers. This helps keep the stamped piece a consistant thickness instead of it getting thin where it is stretched tight into corners etc. It also keeps it from being stretched apart in the pressing process. They also sandwich thin plastics in between pieces sometimes to help deaden sound and insulate between the inside and outside of large panels. As sharp as some of the bends are on the reciever parts, this might make sense. I visited his shop in Wichita, where they have a huge press for forming fuselage panels and stamped engine parts. I don't remember how many hundreds of thousands of pounds the press exerts, but the ram as I recall was four feet in diameter. He put a copper penny in the press and it came out about the size of a coffee can lid and about the thickness of a piece of paper... and hot too. They also had a milling machine with a 24 foot diameter table for machining ring gaskets for rockets.
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    Senior Veteran bladeworks123's Avatar
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    Quote Originally Posted by Smokehouse69 View Post
    It wasn't cut off anything, that is the end cap from one of the G3 stocks from CTD. I pulled the plastic stock off and removed the recoil rod and spring. The edge I'm showing is the edge where the stock is meets the metal.
    After prying off the plastic stock I sanded the edge with a Dremel flapper sanding wheel prior to welding a metal plate across the back. I am making this an endcap for HK33 pistol build.
    Did it give you any trouble when you welded it? I would think maybe if it was copper in there it might weld a little different.
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    there is a guy in the valley here that has a press shop. he has several press's up to 500 ton. i stopped by there a while back to see what he could do and the machine just eats up the steel roll and pounds out shapes all day long. very kool!!!
    have cnc mills, will work for food.
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