Cnc Drilling Machine For Boiler Barrel Model Hd1715/3Ideal Drilling & Broaching Machine for boiler barrel and boiler collector Drilling through-holes andlocating-holes Coolant circling & chip removal automatically Three drills drilling simultaneously,1300 holes per 8 hours Directly transform of CAD/CAM Max.size of workpiece(D×L×T)(mm):1700×15000×50 Max.diameter of drilling(mm):Φ63(Drlling through only one time below Φ52mm)