FIELD: machine engineering, possibly abrasive finish working of shafts with variable cross section and helical surfaces of precise screws, for example screws of screw pumps of hard-to-form materials by embracing grinding process. SUBSTANCE: apparatus includes tool with abrasive layer applied onto its surface and it is provided with individual drive for rotating tool around its own axis. Tool is in the form of flexible wire-abrasive shaft having abrasive layer on its whole periphery. EFFECT: enhanced quality, efficiency and accuracy of working, intensified process for working screw surfaces of shafts with variable cross section. 5 cl, 3 dwg
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