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Thread: Spot welder lower tong mods

  1. #41
    Indian Admin Winn R's Avatar
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    Quote Originally Posted by 7.62x39
    They are metric, 8x1.25mm
    For anyone else who is too impatient; the existing lower tong can be straightened out in a press.

    The closest tap and die in my shop was 5/16" nf 24. To my amazement, It Worked.

    Thank goodness the soft copper is so easy to work with-- normally, with a pocket full of money, I can't tap a streetwalker in the combat zone.

    There is no nonsense so errant that it cannot be made the creed of the vast majority by adequate governmental action. -- Bertrand Russell


    "Never attribute to malice that which can be adequately explained by stupidity." Robert J. Hanlon

  2. #42
    Gunco Regular droog's Avatar
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    Quote Originally Posted by 7.62x39
    They are metric, 8x1.25mm


    ohmysac,

    Aluminum is a excellent conductor of heat, but a poor conductor of electricity.
    Aluminum would be your last choice here.
    It cant be that bad they use it for high voltage power lines and they used to use it in house wiring.

  3. #43
    Chief Administrator 7.62x39's Avatar
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    Quote Originally Posted by droog
    .... and they used to use it in house wiring.
    Used to, being the operative phrase here.
    The reason they stopped using it is because, under heavy load it would get hot, in some cases hot enough to melt the insulation, causing a short, and starting a fire.

    The reason it gets hot is because of resistance.
    Have you ever tried to jump start a car using a set of cheapo aluminum booster cables? did you notice how hot they get?

    Aluminum will obviously conduct electricity, but with nowhere near the efficiency of copper or even steel.
    .

  4. #44
    Chief Administrator 7.62x39's Avatar
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    I found a conductivity chart.

    Where copper is rated at 89.5 to 100% depending on the type, Aluminum only rates 30-50% depending on the alloy.

    http://www.amm.com/index2.htm?/ref/conduct.HTM
    .

  5. #45
    Gunco Member Lukw's Avatar
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    Why can not they make the spot welders to work on a double pole(120 volt each pole put them toghter for 208 volts) 208 volt instead of the 230 volt high leg set up? Most people have only 120 volt double pole as home availibilty.

  6. #46
    Chief Administrator 7.62x39's Avatar
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    For what we are using them for, the 100 volt, works better than the 220 volt.
    The 220v is kinda overkill on this thin stuff.

    The 220 will work, but from the reports I've heard it is easier to get a strong, nice looking weld with the 110v, with less chance of burning through.
    Although recent reports might prove the problem to be operator error.
    .

  7. #47
    Gunco Member tom1263's Avatar
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    Default What the F%##$!!!

    How can I cut down this 5/8 rod without a milling machine????

    I tried.....

    Dremel
    End mill in my drill press
    Sawzawl
    Grinding wheel in my driil (too slow)


    HELP...it taking forever!!!!

  8. #48
    Chief Administrator 7.62x39's Avatar
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    Do you know anyone with a bench grinder?
    .

  9. #49
    Gunco Veteran AK Builder FloridaAKM's Avatar
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    I have had no luck finding replacement tips for the spot welders. McMaster-Carr has stocks tips, but not for these welders. I guess that I need to use a lathe to make new tips out of the stock that is left over from making the modified straight bottom jaw for welding the AK's



    Quote Originally Posted by 7.62x39
    A 5/8"X12" copper bar runs $10 at Mcmaster-Carr.
    The tips are designed to be replaceable and should be available from a local welding supply house.

  10. #50
    Indian Admin Winn R's Avatar
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    Quote Originally Posted by Winn R
    For anyone else who is too impatient; the existing lower tong can be straightened out in a press.

    The closest tap and die in my shop was 5/16" nf 24. To my amazement, It Worked.

    Thank goodness the soft copper is so easy to work with-- normally, with a pocket full of money, I can't tap a streetwalker in the combat zone.

    You can reuse the old tips by retapping.
    There is no nonsense so errant that it cannot be made the creed of the vast majority by adequate governmental action. -- Bertrand Russell


    "Never attribute to malice that which can be adequately explained by stupidity." Robert J. Hanlon

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