Difference between DTH(Down the Hole) Drilling and Top ...
2017-12-15u2002·u2002Blow Frequency: 30 – 60 Blows/Sec (Top Hammer), 25 – 35 Blows/Sec (DTH) Rod/Tube diameters: 23 – 140 mm . Top hammer drilling principle. When the piston hits the shank, kinetic energy in the piston creates a compressive wave in the string of drilling tools, that will cause the bit …
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