Allit AG Kunststofftechnik

15 A practical example: fan wheels. Let us consider the intellectual exertions that were an everyday fact of life during the early days at Allit. Every design drawing was made on paper, in two dimensions. However, everything they portrayed, every intended end result, was three-dimensional. Although the building of models was general practice, for that very reason the geometric figures on paper had to be precise enough for the machine operatives to be able to work from them. Aluminium test tools were one option for keeping correction costs to a minimum. Have a go at drawing the three blades of a typical table fan, doing it so exactly that a machine can be built just from your ... but enough of that. Fortunately, today we have 3D CAD programs that can portray the most complex shapes as free-form surfaces. The advent of 3D programs was greeted with great enthusiasm in the design department. They liberated many of the people working there from long hours of painstakingly producing pen and ink drawings on tracing paper.