Efficient operation of rotating technological units in the period between overhauls largely depends on parts of backup abutments -bandages and rollers. At the same time an effect of rolling surfaces ground contact areas shape of these parts takes place, which in the end determine contact spot characteristics.The purpose of this study is to investigate the influence of errors form surfaces bearing parts as well as their relative position on the stress-strain state in the contact zone. As a result of studies questions concerning contact surfaces modeling of bandages rolling surface and support roller of technological drums conditions, influence of their relative positioning on surface formation in a contact zone were resolved. Geometric and power characteristics of contact spot for various cases of positional relationship of bandages and rollers axles were obtained. The simulation results generally show that the length of the contact patch at small angles of rotation (3 degrees) does not change significantly; lowest stresses occur at the ends of the contact line, and change in length are unevenly; the maximum stress occurs at the center of the rotation axis and a third stress higher than the case where the axis are parallel. Contact patch shape is slightly different from the rectangular shape, but is asymmetric with respect to the axis of the bandage; a zone of low stresses at the ends of the contact spot, shows a change in the contact patch shape from a rectangle to an asymmetrical oval.

Various techniques and devices are used to determine the shape errors of large-sized parts of technological units. This is important for the correct assignment of parameters for further reduction processing by special machines and machine tools. The acquired errors arise for several reasons: 1) large dimensions and weight of rotating parts, 2) the instability of the axis of the rotating part mounted on two support rollers, 3) the available initial and acquired shape error in the cross section of the part. It is important to define the types of form errors of the surfaces, error analysis, prediction and calculation of deviations from roundness in the cross section of the bandage, and the evaluation of cylindricity. Modeling of the process of operation and diagnostics of the unit, development of methods for determining errors, calculation of real values of deviations from the original contour on the basis of reconstruction of the contour of the section becomes important and necessary. These processes are performed using modern CAD systems and software. Obtaining data arrays in the process of measurements and their processing with the help of a special software module that performs an interactive calculation of shape errors with different geometric parameters of the cross-section of the bandage, provides the ability to obtain information about the state of the outer surfaces and parts of the supports on the operating unit. This article presents a method for determining the geometric parameters of the shape in the cross section of the rotation part, algorithms and software for reconstructing the contours of the cross sections of the part and calculating the shape error of the outer cylindrical surfaces

The textbook provides the main stages, sequence and general methodology for designing technological processes for machining parts and assembling products in mechanical engineering. In the main sections, after the presentation of the elements of the theory, examples of their specific implementation are given. For undergraduate students studying in the areas of training 15.03.01 "Mechanical Engineering", 15.03.05 "Design and technological support of machine-building industries", as well as specialists studying in the specialty 15.05.01 "Design of technological machines and complexes", full-time and correspondence forms of study, mastering the methodology of technological design and performing course and diploma projects and works.

This article discusses and analyzes mechanisms based on the principles of parallel kinematics, designed to perform various technological actions, with the movement of the executive body along complex spatial trajectories. Mechanisms with parallel structures have wide possibilities for solving various problems of application of equipment and technologies. Promising are the tasks associated with the use of mobile bases in various simulators to gain skills in controlling equipment (aircraft, cars, specialized military equipment). To conduct research on kinematic and dynamic characteristics, a digital layout of the platform has been developed – a parameterized 3D model in a CAD system. The platform represents a system with six degrees of mobility, which are implemented on the basis of a mechanism with a parallel structure. A description of a dynamic simulation model with six degrees of mobility developed using the MSC Adams software environment is given. The model is intended for research at the stage of design work in the development of simulators of various vehicles. The developed dynamic model was tested in order to implement a methodology for conducting research on the kinematic and dynamic characteristics of the platform based on simulation modeling. The results determining the capabilities of the model for determining the dynamic and force parameters in individual elements of the platform at the specified geometric parameters of the platform design are presented. The methodology of studying the digital layout of the platform by simulation modeling consisted in the execution of the accepted trajectories by the model, taking into account the technical characteristics of the actuators. At the same time, certain dynamic indicators were recorded and processed. As a result, graphs of changes in velocities and accelerations of the center of mass, as well as force characteristics (the sum of forces applied to the body in the hinge) when performing the corresponding trajectories are constructed.

The textbook provides information from the theory of basing and dimensional circuits; quality characteristics and indicators of manufacturability of products are considered, as well as the principles of group processing organization and features of technology design for numerically controlled machines. Complies with the federal state educational standards of higher education of the latest generation. It is intended for undergraduate students studying in the areas of training 15.03.01 "Mechanical Engineering", 15.03.05 "Design and technological support of machine-building industries", specialists in the specialty 15.05.01 "Design of technological machines and complexes", studying the disciplines "Fundamentals of mechanical engineering technology", "Mechanical engineering Technology", as well as to perform coursework and qualification work on mechanical engineering technology.