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Thread: Spot welder lower tong mods

  1. #1
    Chief Administrator 7.62x39's Avatar
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    Default Spot welder lower tong mods

    Here is the way I modified my lower tong to fit inside the receiver.

    I bought a 5/8" x 1' copper rod from Mcmaster-Carr (#8966K221)

    Tip thread size is 8x1.25mm

    The top cut is .230 deep and .735 long.
    The bottom cut is .150 deep X 5.500 long.
    Then cut it to length to match the upper tong.

    This allows full access to the inside of the receiver, even with both rails in place.
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    Last edited by 7.62x39; 03-15-2005 at 08:45 PM.
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    Chief Administrator 7.62x39's Avatar
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    Align the tips and clamp in place.

    About 3 seconds works well for welding the rails

    Here's some pics of a junk receiver I use for practice.
    I was not concerned with alignment, just the weld
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    Gunco Samurai Polish Taipan's Avatar
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    Thanks 7.62, that's exactly the kind of pics and info I need to get going when I am finally ready. God that reminds me I need to order that HF drill press while its still on sale.

    How do you hold the rails in alignment while you weld?
    So you really think the Tapco rails are junk?
    ____________
    "The way of the warrior is death, this means choosing death whenever there is a choice between life and death. It means nothing more than this, it means to see things through, being resolved."---Yamamoto Tsunemoto's Hagakure

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    BANNED mbadboyz's Avatar
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    Great posts! Awesome pics. Im going tomorrow afternoon th HF to pick mine up. They are holding my 115v spot welder.

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    Gunco Irregular Grendeljaeger's Avatar
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    Nice work(as usual)Max !! We are very lucky that you have an interest in taking pictures as well as building firearms as not everyone gets their ideas across in such clear manner.
    Gunco member #11


    “it is dangerous to be right in matters about which the established authorities are wrong” Voltaire

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    BANNED mbadboyz's Avatar
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    I picked up my spot welder today. Does it make a difference how far back the tongs are into the spot welder before you tighten them down? Im trying to avoid cutting the upper tong to size. I dont own a mill so I will have to dremel the lower tong. Wish me luck.

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    Chief Administrator 7.62x39's Avatar
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    Quote Originally Posted by mbadboyz
    ... Im trying to avoid cutting the upper tong to size...
    That's why I bought the copper rod from M-C to make the lower tong.
    If you do that, you can leave the upper full length
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    BANNED mbadboyz's Avatar
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    Quote Originally Posted by 7.62x39
    That's why I bought the copper rod from M-C to make the lower tong.
    If you do that, you can leave the upper full length

    Does it make a difference how far back the tongs are into the spot welder before you tighten them down?

  9. #9
    Chief Administrator 7.62x39's Avatar
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    The clamp that holds the tongs in, is about 2" long and secured by 4 bolts.

    You could probably move the tong some, but I would think it would need to be at least halfway in, in order to secure it. Meaning you may be able to get 3/4 to 1" of adjustment out of it.
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  10. #10
    Gunco Veteran Toten Kopf's Avatar
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    LOL...

    I just posted the modification update to my 115VAC spot welder. But I posted it in the "Machine Shop" forum. Is it in the wrong forum?

    I like the way you did your tong. Only thing is I don't have the capabilities to do the machining. Mine mod is the cheaper version...LOL

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