--- ralucas4277 <
ralucas4277@...> wrote:
> Hi Curt,
>
> After your previously posted details of your system,
> I carried out some
> more tests on pcb spark erosion. What became
> immediately clear was the
> requirement for an accurate wire feed for the
> electrode.
>
> I put together a mall stepper driven wire roller
> feed mechanism, using
> a gearbox and a butchered capstan mechanism from an
> old tape recorder,
> with fixed orifices above and below the vertical
> roller wire drive,
> thus giving the step in/out for the spark
> initiation. This worked using
> 10 mil wire, (smaller dia wires are more difficult
> to source easily in
> small quantities in the UK, if anyone knows better,
> please let me
> know), but the need for a more precision unit was
> needed, and other
> things intervened. I bought a micro lathe intending
> to put together a
> higher precision unit. A servo motor rather than a
> stepper may give a
> speed increase.
>
In the US small quantities of
1 mil stainless, 5 mil tungsten and 5 mil tantalum are
easily sourced at www.smallparts.com. Search for "wire".
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