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The problems of accuracy improvement at billet processing withemphasison the influence degree of errors in tool holder geometric forms on the accuracy of the in-line arrangement and tangent stiffness atfixing in a machine spindle are considered. The most frequent cases of form errors, occurring at the tool holders production, are considered: circular deviation (particularly occurrence of out-of-roundness in cross-sectional view), deviations of straightness of cone generatrix (bulge, incurvature), angular errors. To evaluate the accuracy of the in-line arrangement and rigidity of corners of the tool spindle intersystem, the ANSYS Software is used.

The article recommends brief principles for working with endoscopic equipment. Maintenance of devices, endoscopes and instruments. Algorithms for cleaning and disinfection of flexible, rigid endoscopes and more are given.