Nikom Chimnok on mon 16 jun 97
In Danisch and Norsker's Self Reliant Potter's series, they advise
filling a ball mill approximately half full of balls.
But recently I attended a workshop lead by a woman trained in Japan, and
she uses a different formula. First she weighs the charge, then weighs
the balls so as to add 1.5-2 times the weight of the charge. This
results in a much smaller volume of balls--the mill is barely a quarter
Can anyone comment on the volume or weight of balls which will yield the
most efficient grinding. I can see how to check it experimentally, but
it would require more screens than I have.
Louis Katz on tue 17 jun 97
According to Cardew for Quartz Limestone feldspar etc., The correct
The charge and water will fill the space between the pebbles so the mill
will not be over full.
Critical speed is
29.923 divided by the square root of r Where r is the radius of the mill
The correct speed for a mill is between 64 and 87 percent of the critical
Texas A&M University Corpus Campus