Ryobi BG828G User Manual 3 - Page 9

Operation WARNING: Do not use wheels rated less than the speed of this tool. Failure to heed this warning could result in personal injury. APPLICATIONS This product has been designed only for the purposes listed below:  Sharpening drill bits  Sharpening lawn mower blades  Sharpening chisels and flat screwdrivers led light SWITCH See Figure 9, page 12. Use the LED light switch on top of the spark shield assembly to turn the lights on and off. Basic operation To be efficient and work as designed, your tools should be kept sharp. Dull tools can and will cause accidents. Bench grinders are ideal for sharpening tools such as chisels, scissors, etc., and for removing rust or corrosion. Grinders remove material rapidly so pressure is the key to efficient grinding. The proper way to sharpen a tool and avoid overheating is:  Keep the object in constant motion, moving it at an even pace.  Never force a tool against the grinding wheel.  Keep the tool cool by using a pan of water.  The grinding wheel should rotate "into" the object being sharpened. Note: Excessive pressure may damage the tool, cause the motor to overheat, and prematurely wear down the grinding wheel. ON/OFF SWITCH See Figure 10, page 12. The bench grinder features a front access on/off switch for convenience and safety. SHARPENING TWIST DRILL BITS See Figure 11, page 13. Drill bits are best sharpened on a sharpening jig (available at most hardware stores). Begin on one side of the point at the existing angle, then twist the bit while maintaining contact with the grinding surface. Sharpen only the tip. This technique requires considerable practice, so take your time and make a few "dry runs" first with the grinder off. Be sure to maintain the original cutting edge angle as this is important to the efficiency of your bits. SHARPENING LAWN MOWER BLADES See Figure 12, page 13. Lawn mower blades are usually sharpened on only one edge and dressed up slightly on the other. Perform this sharpening process on both cutting ends of the blade. After sharpening, be sure to balance the blade by removing additional material. NOTICE: An unbalanced lawn mower blade may cause excessive vibration which will damage the lawn mower. SHARPENING CHISELS AND SCREWDRIVER BLADES See Figure 13, page 13. When sharpening chisels and screwdrivers, work rest should support the chisel at the correct angle against the wheel. 9 − English