line drilling

line drilling

[′līn ‚dril·iŋ]
(mining engineering)
The combined methods of drilling and broaching for the primary cut in quarrying; deep, closely spaced holes are drilled in a straight line by means of a reciprocating drill, and webs between holes are removed by a drill or a flat broaching tool.

line drilling

In rock excavation by blasting, drilling a series of closely spaced holes, about 4 in. (10 cm) apart, at the perimeter of the cut, so as to break the rock along a line.
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References in periodicals archive ?
Quarry and mine drillers now have the advantages of total-site positioning available as standard features in a top-hammer drill rig for line drilling and blastholes up to 5 in.
Fully equipped shop with air lines & pneumatic tools, 220V/3-phase electric, permitted spray booth, Brandt edgebander, double line drilling machine, Kaeser air compressor.
From top of the line drilling tools, to the clay to day supplies such as grease and vice jaws, RadiusHDD.