Ryobi AG452K English Manual - Page 11

OPERATION WARNING: Always install grinding wheel and abrasive mop disc with the depressed center against the disc flange as shown below. Failure to do so will cause the grinding wheel to crack when tightening the nut. This could result in serious personal injury because of loose particles breaking off and being thrown from the angle grinder. Do not overtighten. to tighten to loosen Grinding Wheel Wrench Flange Nut to tighten to loosen  To install grinding wheel and wire wheel brush, thread the nut on the spindle with the flat side of flange nut facing up. Fit raised, small diameter portion of the nut into the hole in the wheel and finger tighten. See figures 4 and 5.  To install abrasive mop disc, thread the flange nut on the spindle with the flat side of nut facing down. Finger tighten. See figure 6.  Depress and hold the spindle lock button and rotate the wheel clockwise until the spindle locks in position.  Securely tighten the flange nut with the wrench provided. Do not overtighten. NuT TURNED INCORRECTLY NuT TURNED INCORRECTLY flange NuT TURNED CORRECTLY WIRE Wheel BRUSH to tighten to loosen flange NuT TURNED CORRECTLY ABRASIVE MOP DISC Disc Flange Spindle Flat(s) Disc Flange Disc Flange Spindle Lock Fig. 4 Fig. 5 Fig. 6 GRINDING, SANDING, BRUSHING See Figure 7.  Always carefully select and use grinding wheels that are recommended for the material to be ground.  Make sure the minimum operating speed of any accessory wheel selected is not less than 11,000 RPM.  The grinding wheel provided with the angle grinder is suitable for grinding welds, preparing surfaces to be welded, grinding structural steel, and grinding stainless steel.  The wire wheel brush is suitable for removing paint or rust from metal surfaces.  The abrasive mop disc is suitable for sanding flat metal or wood surfaces.  Secure all work before beginning any operation.  Secure small workpieces in a vise or clamp to a workbench.  The key to efficient operation is controlling the pressure and surface contact between the grinding wheel and workpiece.  Flat surfaces are ground at an acute angle, normally between 5° and 15°.  For maximum control, hold the angle grinder in front and away from you with both hands, keeping the grinding wheel clear of the workpiece.  Start the angle grinder and let the motor and grinding wheel build up to full speed.  Gradually lower angle grinder until the grinding wheel contacts the workpiece.  For best results keep the angle grinder tilted at an angle from 5° to 15° and continuously moving at a steady, consistent pace. 11