Drilling Techniques for Mining Exploration Equipment
13/12/2018#0183;#32;Rotary air blasting is a type of rotary drilling, where a blade bit or rollercone bit is used to cut and break rock with a simple blade mounted on the end of a rotating drill stem. This stem is rotated while a thrust is applied to it by a pulldown mechanism that uses up to 65 percent of the weight of the machine. As the bit breaks and removes the rock using either a crushing and chipping