I manufacture small square-threaded aluminum parts that
are used in professional music amplifiers. I am having problems
with the polishing media prior to hard anodizing. The aluminum
is 6061 and the grooves are .040 by .040. I first use a
vibratory tumbler with plastic media, and that works OK
for deburring the non-threaded areas, but does very little
for the grooves. I have now built a magnetic spinning tumbler,
and am very encouraged with the almost uniform polishing
action using .035 cut wire media. The problem is a fine
black residue apparently generated from the rubbing of the
stainless steel wires against each other.
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