... and engineering geological exploration or construction, fit for technology of wire line core drilling and reverse circulation drilling, we have designed ... power speed is 1500 r/min)Spindle speed (r/min)16 grade speeds, 37-985 r/minSpindle stroke (mm)600Spindle L ... speed (3rd layer, m/s)0.82, 1.53, 2.16, 3.13Wire rope dia. (mm)15.5Drum capacity (four layer ...