This thesis deals with mechanical turning as one of the most important type of mechanical processing by cutting and with calculation of total time of production by classical turning machine. In the beginning the general information about mechanical turning, forces of turning, general geometry of turning knives and types and shapes of turning knives are given. Afterwards, the historical development of turning machines from the first and most primitive to the most recent is presented. Next thing that this thesis is dealing with are activities that projecting technological process of production is made of, explanation of most important terms related to it and how is total time of production divided. The usual types of turning operations are listed and the ones that are most important and were used in the example in this thesis are explained with more details including mathematical expressions related to them. The calculations of production parameters and of total time are explained through mathematical formulas and expressions and tables with data that are used for this calculation. Tools that were used in the past for faster total time calculation are presented as well as the most recently developed methods in the form of computer softwares made for that puspose. Thus is the total time calculation by using software Sandvik Coromant Coroplus Toolguide presented. The pros and cons of using it are explained. On the example of production of one machining part the way of calculation of total time of production is presented. For some operations the calculation was done by both mathematical classical method and by computer software so that comparison can be made. Based on all of that the conclusion about pros and cons of using computer software compared to classical mathematical method is drawn.