Hexagonal tumbler with good quality rubber lining and 35 rpm speed.
For my silver jewellery, casted as well as hand fabricated, i use
5mm X 5mm angle cut triangles ceramic media polishing grade(White in
colour) its a wet cycle, and put a pinch of 320 grit (only for casted
silver, as first cut to remove casting skin), second cut 1200 grit of
silicon carbide powder or aluminum oxide powder to get a fine very
smooth finish with out reflection, then to get high shining, i
burnish the silver with highly polished steel media (combination of
balls,pins,ballcones,ovals, i also put pins used in magnetic tumbler
so it reaches fine crevices of filigree work.
Once in a while I polish my steel media with quarter micron Boron
carbide powder (boron carbide powder is also used for polishing
gemstones), a pinch of it for 4 hours, you normally fill the tumbler
half with the media and put water one inch above the media, and then
charge with the load (silver).
My experience with this slow speed hexagonal barrel is the best, I
have also used vibratory tumblers and I also use centrifugal barrel
machine, but i have experienced that this slow 35 rpm hexagonal
barrel is the best,slow and steady wins the race.
I use 4 liters size. I wash my barrel thoroughly between two
different cycles so no residue of previous cycle and media is left,
the best thing is to use separate barrel for each media if it is
Best of Luck
Wishing all my Orchidian friends total Health Mental, Physical,
Spiritual and Social.
Strive to be Happy