The study objective is the development of devices for high-accuracy machining of machine parts. The problem to which the article is devoted is the analysis of the joint influence of location vees on the accuracy of workpiece locating. Research methods: modeling the contact of the workpiece with the location vees using the theory of dimensional connections, regression analysis of modeling results of installing workpieces in the location vees. The novelty of the work: the formation of the workpiece error of locating when it is installed on a device with two location vees and a random distribution of the accuracy parameters of the base surfaces is considered. Study results: a model of self-installation of the workpiece on two location vees is developed and dependences are obtained for estimating the workpiece error of locating, taking into account the normal distribution of accuracy parameter values within their tolerances. Conclusions: taking into account the probability of distribution of the values of base surface accuracy parameters within the tolerances reduces the values of the workpiece error of locating, which makes it possible to reduce the requirements for the accuracy of the devices reasonably.

An impact of different accuracy parameters of supporting prisms used in designs of machine units upon the accuracy of billet installation is considered. As a method for the estimate of installation accuracy a dimension analysis is used. There are shown peculiarities of the technological support of supporting prism accuracy.

Work objective: development of devices for high-precision machining of machine parts. The problem to which the paper is devoted is to analyze the accuracy of devices with location vees. Research methods: modelling of the contact of the workpiece contact with the location vee by means of the theory of dimensional connections, analysis of some model parameter influence using sensitivity analysis, regression analysis of the results of modeling the workpiece fixing in the location vees. The novelty of the work: the influence of form tolerances and the relative location of the base surfaces are established when calculating the accuracy of fixing workpieces in location vees; the features of forming basing error in the worst case (by maximum-minimum method) and taking into account the probability of size distribution within the tolerances (by the probabilistic method) are revealed. The results of the study: a model is developed for installing the workpiece into a vee, taking into account misalignment and deviations from roundness, dependencies are obtained for estimating the error of basing the workpiece in the location vees, taking into account these macro-displacements. Conclusions: the error of basing the workpiece in the vee is influenced by the tolerances of the form and location of the base surfaces; taking into account the errors of the form and location of the workpiece base surfaces make it possible to form the error of the base in the horizontal plane.