In sandy strata, 7 to 9 inches diameter holes are drilled with a percussion type drill rig.
Source: wiktionary
Drill rig
Synonyms for "drill rig" (3 found)
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Closest matches (1)
Noun(1 words)
drilling rig
Strong matches (1)
Noun(1 words)
oil rig
Related words (1)
Noun(1 words)
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1 entriesSample sentences
2 total sentences available.
As no standard drill rig for 38-mm holes was available, Atlas Copco developed the Trakker 526, a drill rig for small-hole drilling that was adapted to narrow vein mining
Source: wiktionary