FIELD: nuclear power industry. SUBSTANCE: apparatus has pole, one end of which is connected with rotation drive and another is connected with tool mandrel. Mandrel body 4 has mounted in it spindle 6 with fitted on it counterbore 7. Shaft 9 with two fixed on it collet cylinders 10. Two more collet cylinders 11 are located on body 4. Tail end gear crown 12 of spindle is connected with increasing planetary gear box 13. EFFECT: apparatus to machine holes is used in process of overhaul or preventive maintenance of uran-graphitic. 5 dwg
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