I'm not sure, but a Burr Mill might be a coffee grinder?
Bought one for the RV last week for about $15...
It seems like it would work well, except that your only control of
course/fine
is how long you run the grinder..

What you are describing sounds like a 'whirly blade' grinder. A burr
grinder has a cutter that looks just like the burrs for a Dremel, or air
grinder. Want more info? visit alt.coffee Dan