FIELD: mechanics.
SUBSTANCE: proposed device comprises two reamers or counterbores and mandrel. It is furnished with detachable head, split casing accommodating drive shaft with shank and gear wheel, intermediate shaft with gear wheel and spindle supporting said reamers or counterbores. Note here that rigid mandrel serves to fit workpiece into bore with a minimum clearance, while spindle is arranged in the casing to rotate in floating hydrodynamic supports made by semi-spherical inserts and to be centered in mandrel by hydrodynamic effect.
EFFECT: higher accuracy.
3 dwg, 1 ex
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