Drilling jumbo

small 2-armed air-powered drilling jumbo

A Drilling jumbo or drill jumbo is a rock drilling machine.

Drilling jumbos are usually used in underground mining, if mining is done by drilling and blasting. They are also used in tunnelling, if rock hardeness prevents use of tunnelling machines.

单词	Drilling jumbo
释义	Drilling jumbo 英语百科 Drilling jumbo A Drilling jumbo or drill jumbo is a rock drilling machine. Drilling jumbos are usually used in underground mining, if mining is done by drilling and blasting. They are also used in tunnelling, if rock hardeness prevents use of tunnelling machines.
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