FIELD: metal processing.
SUBSTANCE: invention relates to machining materials and may be used for expansion of holes for anchor made in concrete or stone, by means of boring. Drill comprises multiple blades, which bore section of prepared hole, blade holder which holds multiple blades to move in radial direction, and shank which holds blade holder. Multiple blades are moved by sliding to expand radially outward relative to blade holder by centrifugal force caused by rotation.
EFFECT: prepared hole boring is provided with increase in service life of blades.
15 cl, 14 dwg
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