[Jewelry making - Article 00541] - Re: [Orchid] Rolling mills square wire grooves

[Daniel Culver]

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Brian,

    Two reason for flats in the bottom of the square wire forming
    groove. 

    1. If the forming groove were fully vee formed the wire wouldn't
    roll out with square corners but rather a wavy edge that was
    fractured continuously. The procedure is to roll down to a size just
    over your final size and proceed with alternating rolling to get a
    square wire. I believe details are in the archive. The reason a full
    groove would roll wavy damaged corners to your wire is that rolls
    never actually line perfectly and don't roll at exactly the same
    speed, if they did then this would indeed be possible. A specialized
    mill would have to be built. 

    2. Cost. Any machined vee groove will have to have a flat or radius
    in the bottom of the groove. Pick your size and then your price. I
    would guess that with a .010'' (about 1/4 mm) radius properly ground
    and hardened in a decent set of rolls (not the whole mill) would cost
    you about $4,500.00 and maybe much more. A .005'' radius could go
    over $7,000.00. 

Dan
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