FIELD: mechanical engineering. SUBSTANCE: opening machining tool has supports for turning blocks. Supports are positioned in spaced relation, with space value being at least equal to three widths of bars. Blocks are made U-shaped. Bar holders are made in the form of plates with step. Rolling shaft is passed through abrasive wheel opening. Holders with bars are spring-loaded at their both ends. EFFECT: increased precision of machining, simplified construction of tool, wider operational capabilities by providing simultaneous machining of closed cylindrical opening and both inner beads in alternation. 3 cl, 7 dwg
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