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The material - in this example, galvanized steel -- is cut to the appropriate diameter.
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The material or blank is placed on a centering device and is then clamped to the spinning chuck.

In the close-up below, you can see the roller before it's pressed against the material.
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As the material and spinning chuck rotate, the roller gradually pushes the metal against the spinning chuck, thus creating the desired shape. The entire operation has been programmed and each step is done automatically, as opposed to hand-spinning.
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The material is now almost fully formed. The final step will be to create the flange.

In the close-up below, you can see the edge of the material extending beyond the spinning chuck.
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The flange is formed by rolling the material over the edge of the spinning chuck. The finished part now has the exact inside dimensions as the spinning chuck.
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A sample of the finished part beside the original flat material.
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