biglou13 wrote:For those that do not throw off the hump, what weight of clay do you use, for formal matcha Chawan, and/or other tea ware items.
Hi biglou. I teach courses on making chadogu (teawares).
While there are exceptions to every rule that a chajin (tea person) can break, the sort of "target" weight for a good stoneware chawan (at about 13 cm dia. and 9 cm h, fired) is about 454 grams (1 pound), finished fired. So the wet forming weight can allow for the trimming of the kodai (foot) and the drying of the water of formation out of the piece...... plus adding in the addition of the weight of any slips and glazes and firing chemical changes. Once you get over about 550 g in that size, they start to feel "too heavy". (A lot of western potters chawan are too heavy. Look nice....but heavy.)
Some Ido style chawan weigh in at only about half that..... and true (Japanese) raku wares and porcelains are typically a bit lighter than stoneware ones.
You hit the nail on the head on the "balance" issue! Perceptive. THAT is as important or likely more so than the total raw weight. To be a little technical here, the center of mass of the bowl needs to be located somewhere in the physical center of the volume occupied by the form. When you move it, it balances about its spacial center.
Attention to the forming of a chawan for actual Chanoyu use is intense...and few "make it". I've been a potter for over 40 years and I get about a 10-20% success rate for saleable ones.
Welcome to the world of clay. Keep working.