I plan to mill a few materials which produce very health hazardous dust including mother of pearl, abalone and bone. All stock would be relatively small, under 50 mm X and Y, and only about 1.5 mm thick.
I was thinking of making an acrylic open-top, low-walled box such that my stock would be covered in water, perhaps with a couple drops of soap, to a depth of a few milimeters. The largest bit I’d be using would be probably about 1.0 mm flat. I think the flute length on the intended bits is small enough that the flutes would be submirged during cutting, I’m not sure if entry and exit of the bit would pose an issue of whirring water around. What else could go wrong?
I also thought of using a deep enough bath and low enough retract height that the bit would remain underwater for the duration. This begs the question of whether the spindle has to travel outside to work area, assuming the zero is within the work, whereupon it would collide with the box walls. I suspect this may happen, at the very least, on tool changes? (Awaiting my Nomad, pardon my ignorance on this aspect.)