Why kiln God, WHY?!?!
This type of cracking has been happening all too often. I stack 2 dinner plates for bisque firing. The feet line up well so that there's no unsupported weight, and I never stack more than 2. The plates are totally bone dry. I ramp up the kiln slowly. So why then do I get these tragic cracks? WHY?!?!?!?!?
Comments
It may also have something to do with compression during throwing.
That's a tough crack on such a beautiful plate. I first noticed that it comes right off the point where you carved in, so I thought maybe you over stressed it there.
But June has a good point, and the crack seems to curve into where the thicker foot ring might be.
Break one open and look at it--if June's suggestion is correct you should be able to see it.
I am on with what June and Will suggest. I think it is beginning where the cutting happens (at the "v"). Another antidote may be to pierce the plate with a fettling knife just below the "v" and see if that stops it. It may not work ??!! But if you were desperate. Another solution may be to cut a "u" shape to not incourage the crack???
John
I'm leaning towards June's cooling theory. I busted it to see the cross section and the plate's pretty damn uniform in thickness.
This type of crack doesn't always show up at the "V" in the cut af the rim. If it were the "V," I wouldn't think it would crack so far into the plate, but I don't really know anything anyways.
Thanks so much for the input!
I can always count on you guys ;)