Thanks for weighing in on this thread. Yes, I’ve considered using regular tumbling to finish my carvings, but it’s a bit rough on delicate protrusions, and as that article you linked to warns:
" Mass finishing in a tumbler works great if all of the items you are polishing are smooth, simple shapes (such as cabochons or cubes) and are of uniform hardness - and you can tolerate some imperfection in the final shape of the finished pieces. Complex shapes do not polish well. Protrusions are shortened, surface textures are smoothed, tiny nooks and crannies are missed, and concave surfaces are lightly done if done at all."
I was wondering if anyone had solved these problems, perhaps by producing a different sort of medium, more analogous to the pins used in magnetic finishing machines, which do a good job of getting into the nooks and crannies of complex castings. I also wondered if using diamond grit instead of carbide or alox would give it more ability to grind into the concavities which normal media miss.