... efficiency 2,Lightweight,high detachability ,easy transportation 3,easy operation,safe and reliable XY-1 Core Drilling Rig is suited for ... substitute for chuck. The rod can be replaced without shutdown.3. Centralized handles, easy operation, safe and reliable.4. The ... 1440 (mm)Weight(without power unit) 500kgSwivel HeadSpindle speed(3-speed) 142/285/570 r/minSpindle stroke 450mmupward displacement speed ...