They all broke into 3 or 4 large pieces.
Now I have a Bailey slab roller and made a couple of rounded rectangle tiles (18 x 10). I ran them once through the slab
roller (5/8"). They both cracked into large warped pieces in the bisque.
I tried again with the platters and rolled them down gradually in different directions until they were at 5/8 inch. I put them
on the wheel to cut them round (20 inches) and did a little compression with a rib, as well as pulled up a rim. They are drying
now and I hate to lose them in the firing.
My questions are, should I buy single shelves to fire them on? Could it be the fault of the overlap on 2 half shelves? Should I try putting,
maybe, grog underneath them to create a movable surface? Or, could the way I rolled them out do the trick?
I'm firing to cone 6 electric with an extended cool down program.
Attached is a picture of one of the platters, rolled by hand, that I glued back together. You can see the cracks.