Because of the not enough deviations in precision machining, there are less defective productions. So the method causes a reduced rejection rate of parts. For that reason, the price of materials is reduced. The deviation is simply permitted on 1 facet of your nominal price On this tolerance measurement. https://www.sedlacek-t.cz/masturn-550i-vykonny-soustruh-s-presnosti-a-flexibilitou/