Engineers can design anything. They think systematically, yet creatively. I'm sure an engineer could design something that grinds, and I definitely know engineers that smoke pot.

Anyhow, a grinder doesn't "grind" so much as it shreds. Its a series of tightly fit blades, but on a smaller scale than farming equipment so you couldn't dismantle it.

I realize it isn't very practical, but it seems interesting to solve. picture