machine drill การใช้

• And as a gigantic machine drills its way to Mega Tokyo's main nuclear power plant, they meet again with an old and deadly enemy.
• In jet grouting, a machine drills into the earth, sucks out a column of dirt and injects fast-drying grout, a kind of cement, in its place.
• Bow drill ( strap-drills ) are the first machine drills, as they convert a back-and forth motion to a rotary motion, and they can be traced back to around 10, 000 years ago.
• In a process similar to that for constructing water wells, a bore machine drills vertically in the ground, and two or more steel casings are set in the well in a reverse telescope manner.
• But as the machines drill into the earth, leaving mounds of dirt like molehills around the city, vestiges of ancient civilizations are being unearthed _ including tracks on which the fastest vehicles of their time were raced.