Precision machining is usually a kind of CNC machining system that uses computer-managed machine tools for parts production. Bilateral Tolerances: In this type of tolerance, variation in dimensions is permitted in both equally directions. It's approved with the tolerance limit to be equally above or below the meant sizing. https://www.sedlacek-t.cz/masturn-550i-vykonny-soustruh-s-presnosti-a-flexibilitou/