The discussion about tumble-polishing castings has reminded me of a
question I’ve been wanting to air for a while.
We use stainless steel shot for tumbling our silver castings.
Funnily enough, despite the same process being used all the time, the
end results are inconsistent. Sometimes the finish is excellent,
other times the same designs can come out with many tiny dents.
Everything throughout the tumbling process is weighed and measured
every time. (We use 150ml C6 Dreher liquid.) Every tumble is exactly
the same. So why the different results??? There must be some
variable we haven’t thought of - but what is it? Any suggestions
Could the following piece of info be a clue, or is it a separate
The stainless steel shot sometimes turns black and smells ‘rusty’. (I
thought it was called stainless because it didn’t rust!) It will be
fine for weeks and then suddenly go black, for no apparent reason.
Can anyone suggest why this might happen, and how to deal with the
black and smelly shot? At the moment we wash the stuff and put it
back in and that usually fixes it.
After having read Orchid for a couple of months, this is my first
posting. Looking forward to hearing from all you people who always
seem to have good ideas about everything jewellery-related!