noun
rock drill; jackhammer; pneumatic drill
A heavy tool that drills into rock or concrete, often powered by compressed air.
工事現場で削岩機の音が響いている。
The sound of a jackhammer echoes at the construction site.
削岩機を使って岩盤に穴を開ける。
They use a rock drill to bore holes into the bedrock.
Compound of 削 (saku, 'cut, shave') + 岩 (gan, 'rock') + 機 (ki, 'machine').