The Radial Drilling Machine Model Z3050*16with wide range of application,easy operation ,reliable accuracy and convenient maintenance ,are suitable fordrilling ,counter-boring ,reaming ,spot facing and tapping on large and medium-size workpieces .When equippie with definite devie ,it can also be used for boring . The spindle speed and the feeding rate can be preselected without stoppiont the machine by means of handly and reliable preselecting mechansim. The hydraulic clamping system ensures the spindle head ,arm and column to be firmiy clamped during operation . The horizontal shaft feeding mechanism adopts a clutch composed of three-row-ball.Thus it can be easily and reliably operated with less force.