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Summary: Seal the bottom of the clay to the bat so the clay does not shift off center. Learn how to center clay on a potter's wheel to throw a pottery mug in this free ceramics video.
Chris Cook received a BFA in ceramics and sculpture from Southern Oregon University where he studied raku, studio ceramics, stoneware, and various firing techniques under Jim Romberg....read more
"Okay. So with these mugs, this is what I like to do. I'll go, a little bit bigger than the tumblers. I like my mugs to have some weight on them. Maybe about, about a pound and a quarter. After a while you'll be able to feel how much these are. And then I'm going to make sure this is the top. It usually has a spirally thing, it has a nice bottom piece right there. That was nowhere near the center. Right there. Move it a little bit on the center. Alright. What I'm doing with my finger here, is I'm sealing it to the bottom of the bat, or to the, I'm sealing the bottom to the top of the bat. That means so when I go to, when I'm centering this piece, this is such a small piece to, they have a tendency of not sticking to the bat which you'll find down the road, you'll see. You don't want it to shift off. So you want to secure it down here like that before you go any further."
eHow Article: Centering Clay to Make Pottery Mugs