FIELD: mining.
SUBSTANCE: device for directed drilling of blastholes using the drilling machine by earlier fixed reference point contains the indicator combined with the reference point in the form of the rod which is fitted with the linear goniometric scale graduated by the formula: 
, where Lα - the segment length corresponding to the size of the angle (α); α - angle size, deg.; b - distance from the drilling machine axis to the reference point; L - length along the axis of the drilling machine from blasthole spudding place on the wellhead plane to the reference point. Besides, the rod is fitted with a clamp, a slider with a stopper, and from the end face with the flat base arranged perpendicularly to the rod.
EFFECT: device has simple design, its use allows to orient the drilling machine in the pre-set direction within minimum time period.
4 dwg
