[Jewelry making - Article 00461] - Re: [Orchid] Soldering investment, fixtures

[JoJu428]

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    There have been a number of suggestions relating to the problem of
    holding parts together for soldering where wiring, clamping or third
    arm devices are either inappropriate or not feasible for the
    particular problem at hand. In situations where the usual techniques
    will not work, I resort to a product readily available to the dental
    profession-simply called soldering investment. Plaster of Paris,
    dental stone and casting investment can also be used but a longer
    setting time will be necessary. The parts to be assembled are
    positioned and held there with either sticky wax, a quick setting
    acrylic (Duralay brand, another dental item), or even crazy glue.
    The soldering  investment is mixed rather thick and a mound is
    placed on a slab (glass, plastic, or sheet wax). The "assembled
    unit" is gently shimmied into the mound and the parts containing the
    wax (or other temporary holding stuff) is left uncovered by the
    investment to allow the subsequent placement of solder. Also broad
    areas not involved with soldering should also be left uncovered to
    allow the heating of the metal. After it sets (about 1/2 hr) wet it
    down to be able to slide it off the slab. The sticky wax can be
    flushed away under running hot water, the other stuff if used can be
    burned off (good ventilation ) flux applied and also solder, and
    place the unit on a soldering stand. Heat all around and then focus
    on areas containing solder. After the solder flows, wait a few
    minutes and then place in water container to break down the
    investment. 

    It really is easier done than described and is a very effective
    means of doing multiple solderings at one time.  HTH  Joe Dule

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