Ryobi P423 Operation Manual - Page 10

OPERATION GRINDING WITH THE TOOL See Figure 13, page 14. Always carefully select and use grinding wheels that are recommended for the material to be ground. Make sure that the minimum operating speed of any accessory wheel selected is 10,600 r/min. or more. The grinding wheel provided with the tool is suitable for grinding welds, preparing surfaces to be welded, grinding structural steel, and grinding stainless steel. To grind with the tool:  Secure all work in a vise or clamp to a workbench. DANGER: Never use the tool with the guard removed. It has been designed for use only with the guard installed. Attempting to use tool with guard removed will result in loose particles being thrown against the operator resulting in serious personal injury.  Remove the battery pack.  Install wheel guard and grinding wheel.  Install the battery pack.  Hold the grinder in front and away from you with both hands, keeping the grinding wheel clear of the workpiece.  Turn the tool ON and let the motor and grinding wheel build up to full speed.  Lower the grinder gradually until the grinding wheel contacts the workpiece. WARNING: To prevent loss of control and possible serious personal injury, always operate the grinder with both hands, keeping one hand on the side handle.  Keep the grinder tilted at an angle from 5° to 15° and continuously moving at a steady, consistent pace. NOTICE: If the grinder is held in one spot too long, it will gouge and cut grooves in the workpiece. If the grinder is held at too sharp an angle, it will also gouge the workpiece because of concentration of pressure on a small area.  Use just enough pressure to keep the grinder from chattering or bouncing. NOTE: Heavy pressure will decrease the grinder's speed and put a strain on the motor. Normally the weight of the tool alone is adequate for most grinding jobs. Use light pressure when grinding jagged edges or loose bolts where there is the potential for the grinder to snag on the metal edge.  Lift the grinder away from the workpiece before turning off the grinder. CUTTING WITH THE TOOL See Figure 14, page 14. It is important to understand the correct method for cutting with this tool. Refer to the figure in this section to learn the correct way to handle the tool during a cutting operation. WARNING: To maintain proper control, always operate the tool with both hands, keeping one hand on the side handle. Loss of control could cause an accident resulting in possible serious injury. WARNING: Since wheel is exposed on underside of work, keep hands and fingers away from cutting area. Any part of your body coming in contact with moving wheel may result in serious injury. WARNING: Do not grind with the side of the cutting wheel. Abrasive cutting wheels are intended for peripheral grinding, side forces applied to these wheels may cause them to shatter. To make the best possible cut:  Clamp the workpiece firmly and cut close to the clamping point to eliminate any vibration of the work. Cut the workpiece using the peripheral edge of the cutting wheel. When cutting conduit pipe or angle iron, clamp the workpiece in a vise if possible and cut close to the vise. To cut thin sheet material, "sandwich" the material between hardboard or plywood and clamp the layers to eliminate vibration and material tearing. DANGER: Never use the tool with the guard removed. It has been designed for use only with the guard installed. Attempting to use tool with guard removed will result in loose particles being thrown against the operator resulting in serious personal injury. 10 - English