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How does turning finish dried greenware?

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Stages in the slip casting of a thin-walled whiteware container. Clay powder is mixed in water together with a dispersing agent, which keeps the clay particles suspended evenly throughout the clay-water slurry, or slip. The slip is poured into a plaster mold, where water is drawn out by capillary action and a cast is formed by the deposition of clay particles on the inner surfaces of the mold. The remaining slip is drained, and the cast is allowed to dry partially before the drain hole is plugged and the mold separated. The unfinished ware is given a final drying in an oven before it is fired into a finished product.
traditional ceramics Stages in the slip casting of a thin-walled whiteware container. Clay powder is mixed in water together with a dispersing agent, which keeps the clay particles suspended evenly throughout the clay-water slurry, or slip. The slip is poured into a plaster mold, where water is drawn out by capillary action and a cast is formed by the deposition of clay particles on the inner surfaces of the mold. The remaining slip is drained, and the cast is allowed to dry partially before the drain hole is plugged and the mold separated. The unfinished ware is given a final drying in an oven before it is fired into a finished product.

Turning is a finishing process performed on greenware (unfired pottery) once it has dried to a state of "leather hardness." The technique is primarily used to smooth surfaces and refine specific features, such as creating or finishing footrings on wheel-thrown wares or smoothing undercut areas on molded or jiggered pieces.1

The process is typically carried out while the ware revolves on a potter's wheel or a jigger. By manipulating the revolving clay, the potter can achieve greater precision and symmetry in the final form of the object. While historically a common hand operation, lathe turning became less frequent by the mid-20th century, reserved mostly for ornamental or high-value items.12