Method of drilling a hole-in a rock

Details Method of drilling a hole-in a rock Method of drilling a hole-in a rock

1989-06-01

1990-12-25

Yost, Frank T.

Tool driving or impacting

Processes

175 45, 299 1, B21J 700

Patent

active

049795759

ABSTRACT:
A method and an arrangement for drilling a hole in a rock (6), wherein a preliminary hole is drilled first, whereafter the drilling is interrupted. Joints between a drill boom (2) and a feeding beam (5) and/or the feeding beam (5) in its longitudinal direction are released so as to move freely in order that the boom (2) and the feeding beam (5) would take a substantially strainless position and the angles (.alpha., .beta.) of the joints and the position of the feeding beam (5) and the drill rod are measured. Thereafter the direction and distance from the preliminary hole (C) to the terminal point (B) of the originally designed hole is computed, and the drilling of the hole is completed.

REFERENCES:
patent: 4113033 (1978-09-01), Linblad
patent: 4498544 (1985-02-01), Molin
patent: 4537263 (1985-08-01), Bjor

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