1. Prepare the rock-drilling cavern, the specifications of which can be determined according to the method of drilling. Generally speaking, the height of the cavity is 2.6-2.8 meters when drilling a horiz. [pdf]
The word "jackhammer" is used in and , while "pneumatic drill" is used elsewhere in the , although strictly speaking a "pneumatic drill" refers to a driven jackhammer. In , versions are colloquially known by the name of "Kangos". The term comes from the former British brand name now owned by . [pdf]
Today, if you want to dig a hole in a hurry and there's a thick lump of concrete or asphalt in your way, you're most likely to use a jackhammer, also known as a pneumatic (air-powered) drill, rock drill, or pav. [pdf]
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