Centering the clay is the cornerstone of
throwing on the wheel. It's the process that must be done before any pot can be
formed, and the aim of this tutorial is to go over that process in exact detail,
alongside discussing many of the tips and tricks learned over the years.
4.1 Use the rings that most wheel heads have in order to tell if the lump of clay is in the middle. As you spin the wheel, you'll notice that the lump of clay will probably have a larger gap on one side as compared to the other.
4.2 Push the clay away from
where it's closest to the line until the gap between the clay and the
line is more or less the same all the way around. At this point, you can
even pat the lump of clay into shape a bit to get it as centered as
possible beforeyou begin to add water to it and begin the process
properly.
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4.3 Initially attaching it very firmly is crucial, though, and what you don't want to do is slam it down onto a surface that's already quite wet, as the lump of clay just won't stick to it properly. Ideally, you want a dry wheel head and a dry lump of clay; otherwise, the lump will just fling itself off.
4.4 The first step is to clean the wheel head. Sponge away the excess clay and then dry the metal off with a towel. Take the lump of clay and scrape away all the wet slip on the bottom of it, and then slam this drier, tackier area onto the metal.
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4.5 There is an exception to this rule, and that's when you're throwing on a slightly porous surface, such as MDF wood. In this instance, it helps the piece of clay stick if you dampen the surface.