Suchman ceramics on sun 15 aug 10
Can I make and use ^6 porcelain balls in a ball mill? or? ... Do they need
to be ^10 or higher???
pagan by nature
Louis Katz on mon 16 aug 10
If your cone 6 porcelain fires good and vitreous I would expect them to w=
well. Maybe not as well as cone 10 balls. Either way I would run them by
themselves with just water, or grind a little sand the first time so that=
they are worn smooth. They will add less material to your glazes that way=
If your cone 6 recipe can be fired a tad hotter I would do it.=3D20
Also it is very helpful if your clay is well deaired. It makes a denser
longer wearing and easier to clean ball.
French Flint stones were ( may still be) preferred by some. An advantage=
flint stone is that the stone can be weighed before and after grinding so=
that the amount of silica added to the glaze material can be recorded. Th=
trouble with using more complicated materials like clay bodies is that th=
alkali metals may be in solution and rinsed away or may be added to the
glaze. It is also possible for the alkalies in the clay to defloculate
whatever you are grinding, although I have not seen this happen.
I have thrown a few pieces of broken stoneware and some broken glass into=
ballmill for fun. I do not need or even want the kind accuracy I describe=
above. I love the smooth porcelain shapes.=3D20
Lee Love on mon 16 aug 10
In Mashiko, at the Clay Cooperative, they used riverstones in their
huge ball mills. Here is a photo of one of the mills. I'll look for
the stones on my hd.
=3DA0Lee, a Mashiko potter in Minneapolis
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi