FIELD: machine engineering.
SUBSTANCE: cylindrical calibration head (1) for drilling a shaft (4), comprising three grooves (20, 21, 22) arranged uniformly around the circumference so as to be spaced apart by an angle 120° against rotation with respect to the axis (6) of calibration head (1), wherein the grooves provide removal of chips and supply of oil during drilling, wherein each of the grooves comprises a processing plate that is adjusted in the slot by means of an adjusting cassette.
EFFECT: increase the accuracy and straightness of the processes hole.
12 cl, 7 dwg
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