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Spinning is the process of forming rotationally symmetrical sheet metal profiles. It is carried out on a single-sided tool, as progressive tooling or – in a process known as spinning 'on-air' – without tooling at all. Metal spinning can be utilised to form sheet profiles including cylinders, cones and hemispheres. It is frequently combined with metal stamping and welding to provide a wider range of design opportunities such as flanged edges, asymmetric profiles and perforated shapes.