The work purpose consists in the accuracy increase and assurance of technological equipment manufactured with the wide use of common modules at the expense of the impact of joints contact stiffness. The investigation methods: a theoretical analysis of metal parts contact taking into account their microgeometry, experiments with the use of common modules and means for linear value measurements. The study showed that the value of contact deformations in joints at common modules use is comparable with tolerances for their manufacturing and must be taken into account at the computation of executive dimensions for parts of mating. The existing computations of the value of approach for small areas of a contact have considerable dimensions for which these procedures give large errors. The application extension of ready common modules in the technological equipment structures and in the joints increase requires design procedure corrections. It is necessary to improve the computation pro-cedures for parts contact approach and also the procedures for the formation and computation of complex spatial dimensional chains including contact deformations.

The study objective is the design and technological support of the accuracy of linear displacement modules based on unified parts and assemblies of rail guides and ball screws. The task to which the paper is devoted is to refine techniques in the design of linear displacement modules of machining equipment. Research methods: experimental studies and existing computational research methods to determine the value of contact approach. Novelty of the work: a method of designing linear displacement modules based on unified modules is developed, taking into account the values of contact approaches, where the criterion for assessing quality is the power characteristics of the linear displacement module. Research results: a method for designing linear displacement modules based on unified modules is developed. Conclusions: when designing linear modules for displacing technological equipment, including the value of contact approach in the calculations is usually relevant for high-precision linear modules.

The study objective is to analyze the values of contact approach in the flat joints of special equipment, using unified modules obtained from the experiment and existing dependencies. The task is to compare the values of contact approaches obtained as a result of calculations based on existing dependencies with the results of experiments. Research methods: experimental studies and already existing computational methods of research to determine the values of contact approach. The novelty of the work: refined dependencies are obtained, as well as the values of coefficients of already existing dependencies for calculating the values of contact approaches of extended parts of unified modules during their assembly. Research results: the obtained results of calculations and experiments are analyzed. The values of the coefficients for the existing methods of calculating contact approach are refined, and experimental dependences are obtained. Conclusions: studies have shown that for extended contact sections, the use of calculated dependencies in some conditions gives an error that cannot be neglected. When designing high-precision equipment, such calculations require accurate definition.

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In the paper there are shown the investigation results of technological equipment unit stiffness by the example of a linear coordinate. The coordinate is carried on the basis of a ball-screw pair and rail guides of rolling. The calculation schemes are considered, theoretical and experimental investigations are carried out.