Rotary boring | Article about rotary boring by The Free Dictionary
rotary boring[′rōd·ə·rē ′bȯr·iŋ]
A system of boring in which rock penetration is achieved by the rotation of the hollow cutting tool.
References in periodicals archive
After more than 5 years of work, rotary boring
tools can now handle bores as small as 70 mm, and 40 mm bores will be possible in the future.
The spoils handling system is a single right-hand auger and a high torque reversible rotary boring
unit is also available.
The Zinner 560 rotary boring
system reduces cutting time and gives a 40% reduction in required horsepower over the power needed with conventional drills.