... 3 heavy but easy to disassemble 4simple construction reasonable layout xy-44 can be used either for engineering geological survey, exploring ... spindle rotate speed of power head (r/min)1480(for core drill)Positive (low speed, r/min)80,148,212,308Positive (high ... speed, r/min)247,456,650,945reverse (r/min)66,201Max. torque ...