High concentration is required. Rejects when setting and running in components is a normal process in almost every production: call up the programme, manufacture the part, measure, correct, manufacture a new part - until it fits. This is different in the machining of large parts. Here, the machine operators carefully approach the final dimension to be produced. Because rejects would be an extremely costly mistake with the large dimensions. In addition to the machining centres, a great deal of attention is also paid to the tools used. "We have to be able to rely on the tools," says the operations manager of W. Wolf GmbH from Kalchreuth, Klaus Trescher. Trescher and his team rely on precision tools from Paul Horn GmbH in Tübingen. The most recent project was the implementation of a gear milling process for a shaft from large engine construction.