[Jewelry making - Article 00728] - Re: [Orchid] Tumbling with porcelain media

[Judy Hoch]

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>     I'm just starting to use a tumbler for metal polishing. I have both
>     porcelain cylindrical media in two sizes and dri-shine III.The
>     dri-shine should obviously be used dry:) But for the porcelain
>     media, should I use water and soap? How much? Same for the
>     dri-shine, how much is necessary? Thanks for your help 

    Rebecca - If your cylindrical media is for cut down, an alkaline
    descaling or deburring soluADtion is used. These compounds are
    usually sold as a concentrated liquid. Powdered compounds are
    available to mix with water.  Finishing compounds serve to suspend
    solids, lubricate media, and retard or prevent oxidation of work
    pieces. Use of liquid dishwashing soap or common household
    detergents is not recommended.  There is science to this, and use of
    the prepared chemistry is the best way to get good predictable
    results. 

    In a vibratory tumbler, the amount of media used is normally 80 to
    90% of capacity.  In a closed system, (the liquid does not flow
    thru), you need to experiment on how much liquid to use.  Too much
    liquid will keep the media from working, too little will result in
    accumulated grit on your jewelry. In a little TV-5, I'd use about a
    cup of liquid for example. 

    Any abrasive media should be broken in prior to use.  Run the new
    media for 5 to 6 hours with the appropriate liquid. Check the
    process every hour or two to make sure the crud from the sharp media
    has not accumulated.  You will probably have to change liquid at
    least once.  When the media is broken in, you will no longer feel
    sharp edges on the ends of your cylinders. 

    If you have more questions, several suppliers carry a small book I
    wrote on tumble finishing. 

<edit>

Tumble Finishing for handmade Jewelery
by Judy  Hoch
Read Excerpts this book at:
    
http://www.ganoksin.com/borisat/directory/library/source/31/90/intro/1

<edit>


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


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