[Jewelry making - Article 00147] - Re: [Orchid] Tumble burnishing flat copper disks

[Judy Hoch]

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>               1.  i have just rotary tumbled some flat copper disks in
>     steel shot. as judy hoch described, the edges of the flat disk
>     rolled up a bit. can i remove the rolled edge if i burnish in a
>     ceramic medium instead of steel shot?  do i remember that the
>     ceramic medium will not work harden the pieces?  i wanted the
>     steel shot to work harden the pieces.  if i ran the pieces first in
>     steel shot and then in a ceramic or an abrasive medium, would that
>     trim off the little ridge? (when i burnished off the raised metal,
>     it seemed to scrape off instead of being pushed down.) in her book,
>     judy says that dulling the sharp edges before tumbling with shot
>     will avoid the rolled up edges.  does the edge need to be beveled,
>     or will just a slight rounding do it?  i'm imaging using the
>     burnisher again.  unfortunately, when i burnished my pieces after
>     tumbling my burnisher slipped a couple of times, so i had to go
>     back an clean that up.  i'd like to avoid the burnishing if i can. 

    Ok - I'd guess that the reason for the rolled edge is that your disks
    were cut out with a dull die.  Thus the edge tears rather than being
    cut.  I'd suggest that you sand the edge with a sanding disk on your
    flex shaft, or use a file, or use an expanding drum with 400 grit to
    knock off the torn edges.  alternately, you could run the disks first
    in an abrasive tumbling media to round the edge, the run in the steel
    to harden and burnish. 

>          2.  i have used separate shot and solution for the copper.  i
>     think i remember that i shouldn't combine metals, but i can't find
>     where i read that.  is it ok to combine silver and copper in a
>     steel shot tumble? 

    The caution on mixing metals is that sometimes one colors the other.
    Try it, it will probably work ok. 

Judy  Hoch, G.G.
judy AT marstal.com

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