Ryobi HP612K Trilingual (CD100) - Page 10

OPERATION WOOD DRILLING For maximum performance, use high speed steel bits for wood drilling.  Begin drilling at a very low speed to prevent the bit from slipping off the starting point. Increase the speed as the drill bit bites into the material.  When drilling through holes, place a block of wood behind the workpiece to prevent ragged or splintered edges on the back side of the hole. METAL DRILLING For maximum performance, use high speed steel bits for metal or steel drilling.  Begin drilling at a very low speed to prevent the bit from slipping off the starting point.  Maintain a speed and pressure which allows cutting without overheating the bit. Applying too much pressure will: • Overheat the drill; • Wear the bearings; • Bend or burn bits; and • Produce off-center or irregular-shaped holes.  When drilling large holes in metal, start with a small bit, then finish with a larger bit. Also, lubricate the bit with oil to improve drilling action and increase bit life. 10 - English