International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

In this article, the objects of research are 40 pieces sleeves made from aluminum alloy 6080 and results were obtained from the measurement of the observed sign of inner cylindrical surface runout relative to the external one. The graphical visualizations of the analyzed data were made. A comparison is made between the amount of error obtained by two setting methods on a CNC lathe- in a universal self-centering chuck and between centers.

Presented is a method for determining the tolerances in geometric precision of machining centers in working conditions. The method is based on the implementation of coordinate measurements with contact measuring head. The measurements are performed on special prismatic detail – caliber attachable with relatively low grade precision guidance on the machine table. In the publication are presented experimental studies and the results obtained. The conclusion is that the developed method, the mathematical model and caliber are suitable for the determination of some basic elements of geometric precision of machining centers in working conditions. At the same time provides a satisfying user accuracy, cost and performance.

In this paper I present a research based on technological problem encountered in the machining parts specific aerospace industry made from aluminum alloy extruded profile with length up to 6 meters. Those parts have very tight tolerances, during milling process appear several factors that influence the repeatability of machining processes.