[Jewelry making - Article 00342] - Re: [Orchid] Drawing down tubing

[Dave Arens]

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Hi Georgie,

>     I managed to make my own drawplate out of a piece of hardwood and
>     went down the drill sizes in my general home drill kit. The
>     difference between each bit was 0.5mm and I am having problems
>     drawing down from hole to hole. 

    Typically drawplates to draw wire & tubing are made of tool steel.
    It has more tensile strength than wood & can be finished to a
    smoother finish that wood. The better drawplates will have a carbide
    insert in each hole that when finished properly is smoother than
    tool steel. 

    I'd suspect that a 1/2 mm difference in size between holes is too
    great, especially at the smaller sizes. It may work at large sizes
    over 13 mm with thin wall tubing, but if the tubing is smaller than
    about 10 mm or has a thick wall you'd have problems. The typical
    difference in size at the 3 mm size between holes in a steel
    drawplate is 1/10 mm. When the size gets down to about 1 mm the size
    difference is 1/20 mm. 

Dave
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