... transmission; Friction clutch shift speed; Cardan shaft drive rotary table.AC-SCR-DC, one to two, digital ... electric control system; Drawworks, rotary table realize smooth speed change to provide good operation ... .6Hook hoisting speed, m/s0-1.53Opening of rotary table, mm952.5Rotary table Speeds2+2R Smooth change4 ... ), m11.25*10.6Clear height under rotary beam, m6.26.26.2 Drilling Rig