FIELD: mechanical engineering. SUBSTANCE: mandrel in device is made as extension of drive shaft. It includes unit of sectors coupled to drive shaft and capable of replacement. Cantilever part of the above-mentioned unit forms internal cavity which accommodates internal supporting elements. The latter are made either of alternating balls and polyhedrons, which number of edges equals to sectors in unit, or to polyhedrons. Total length of internal supporting elements along axis of cantilever part of sector units makes up 10-30% of cantilever part length of sector unit. Diametrically opposed sectors are coupled rigidly. EFFECT: smaller mass, wide functional capabilities. 3 cl, 8 dwg
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