[Jewelry making - Article 00156] - Re: [Orchid] Drawing wire, getting burrs

[Jeremy Dunn]

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    I would just like to putt additional thoughts into the problem. When
    rolling out an ingot into square wire stress is caused along the
    corners. You have mentioned that you are getting burrs even though
    stress fractures haven't happened along the corners. This doesn't
    mean that the stress along the grain boundaries has not occurred on
    those corners. 

    I have found when getting these burs, it's usually caused by not
    annealing enough, the quality of the ingot, the quality and
    cleanliness of the draw-plate, starting and stopping in random
    places along the draw, and reducing the roll of the mill too much at
    once. This can cause a squeezed corner which is subsequently folded
    onto itself when turning and rolling of the metal. To help with all
    potential problems, I usually take a little fine grit sandpaper in
    my hand and draw the square wire through the sandpaper a couple of
    times to take the very corners off before going to the round wire
    draw-plate. This eliminates most edges and corners, reducing stress
    in the drawing of the wire. Oh, and use lots of oil or burr-lube. 

    Try this and then work backwards if this does not work. Just some
    thoughts. 

Jeremy Dunn
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