[Jewelry making - Article 00162] - Re: [Orchid] Automotive hydraulic die forming

[Callcbm]

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    using automotive style presses will work for using urethane as a
    bottom dies. 

    I worked at a sheet metal company that built plastic and paper
    machine for a company. 

    there engineers would design a product and it was are job to build
    tooling and form the parts. 

    some of the engineers would design out of this world concepts. But
    we found that all you need is top punch the shape you want a bottom
    die made from urethane rubber the hardness is a trial and error. soft
    will get more detail. 

    Urethane has a characteristic that the more pressure applied the
    less it will deform the first 1/8 inch it move then it take 30 time
    the force for the next 1/8 and so on but we use it all the time as
    its less expensive to only build one die or punch then a die and
    punch that mate. the urethane doesn't have to have much holding in
    case meant it need to expanded when the punch push in the urethane
    acts like a liquid and deflects out but with a lot of pressure it
    will push the metal in punch and take its shape. thin metal shouldn't
    take much pressure I bend 4' of 1/8 plate with a 15 ton press. Some
    time by carving out voids in the rubber assist in the forming or just
    cast a bottom die of you top with the devcon. that what its made for
    Using a press with air assist it would be wise to put a expanded
    metal screen in front and back for a containment for safety. some a
    the jacks have a pressure gauge to tell the force. The harbor freight
    presses work stock with no modifacations there bolts they use are
    soft and will fail with to much pressure Northern tool has some good
    presses for a good price 

    I make a bench model press that just brakes metal but can be changed
    to press what ever 

Contact me off line for a picture of the press
Thanks Randy
AKA Enjen Joes
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