Hitachi G12SA3 Instruction Manual - Page 13

English GRINDER OPERATION 1. Hold the grinder firmly by its housing and side handle (Fig. 1). The grinder produces a counterforce which must be controlled by firmly holding onto the grinder. 2. Turn the grinder "on". (Fig. 3) While holding the grinder firmly, use one finger to slide the switch to the "on" position. 3. Use light grinding pressure. There is no need to press hard when grinding. Usually the grinder's own weight is sufficient to allow the required light contact with the surface to be ground. ON OFF Switch Fig. 3 WARNING: Do not press the grinder forcibly against the surface to be ground. Heavy pressure can result in wheel breakage and serious injury. It can also damage the surface being ground or damage the grinder's motor. 4. Use proper grinding angle. Grind only with the wheel's edge by lifting the grinder 15° to 30°, as shown in Fig. 4. CAUTION: Do not use the entire surface of the depressed center wheel. Use only the edge of the depressed center wheel. 5. Move the grinder in the proper direction. When using a new depressed center wheel in direction A (Fig. 4), the wheel edge may cut into the workpiece. In this case, grind in direction B (Fig. 4). Once the wheel edge is worn, the workpiece can be ground in both directions. 15°~30° NOTE: The wheel provided (resinoid wheel) is rated as Class A grain and # 36 grain size. It is most suitable for heavy grinding of steel and other types of materials. A B Fig. 4 6. Adjust operation to desired finish. For a fine finish, decrease pressure by lifting slightly. Grind slowly and at the appropriate speed. CAUTION: The revolving depressed center wheel will create air turbulence. Do no lay the grinder down in areas of dust or dirt until it has come to a complete stop. 13