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

Processing of thin-walled parts with large dimensions in conditions of wide range production poses a number of technological problems. One of the most important among them is the provision of alignment on both sides of the hole who passing through the opposite walls of the part. Is essential the alignment of the spindles while processing of the hole , if used for this purpose machining center with two horizontal spindles . In the publication is presented research about possibilities to solve the problem by controlling of spindles alignment. For this purpose are carried out contact coordinate measurements of the hole in one spindle using 3D touch probe which is fixed in the other spindle.

In the publication are presented studies to determine the accuracy of the group approach in calculating the cost of technological engineering products. For this purpose, the cost price of a specific item is calculated by applying the developed approach and the group is compared with the actual cost. The results obtained show that the use of group approach enables a comparatively fast and sufficiently precise calculation of the technological cost of machine products.

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.