Uniformly thick surfaces are considered for development. A thick surface is considered to be a set of thin surfaces lying one over the other. A mean surface is defined. Other surfaces in the set are defined in terms of the mean surface as well as the distance between them and the mean surface. Once the mean surface is developable, other surfaces are shown to be developable. These surfaces are developed individually and then a co-ordinate transformation is applied to these developments to take into account the fact that the origin and axes of the development are different for different surfaces. This completes the geometrical development of the thick surface. Plastic deformations taking place during the manufacturing process are not taken into account here.

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