Assessments - 1, GPA: 3
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Facilidade de uso
• Wear the proper protective clothing. Remember that particles flying off of a grinding wheel will be traveling very fast—prepare for this. Wear a face shield, a dust mask and a leather apron. • DO NOT lean into the workpiece in a manner that may cause your hands to move into the spinning wheel if the workpiece slips off. • Concentrate on the task at hand. STOP grinding if there are distractions. After you have switched OFFthe grinder, DO NOTcontinuegrindingandDO NOTmanually stop the grinding wheel with your workpiece! H7762 Heavy Duty Tool Grinder Operating Grinder The grinder is designed for use with ferrous metals only. Grinding non-ferrous metals and wood products will quickly load the grinding wheel surface with particulate matter and ruin its abrasive qualities. It can also cause the wheel to overheat and possibly explode. Always grind on the surfaces shown in Figure 8. Grinding Surfaces Mounting Plate Figure8.Type 50 grinding wheel surfaces. To grind with the grinding wheel: 1. Fill the water cup 3/4 full with water. 2. With the machine plugged into power, stand to the side of the grinding wheel, and turn the grinder ON. 3. Allow the machine to run for one full minute to ensure that the grinding wheels are safe for use, then move to the front of the machine. 4. Grasp the workpiece tightly and properly support it on the work table. 5. Place the workpiece against the surface of the wheel with moderate pressure, moving it back and forth in a steady, even motion. Note: Using too much pressure will slow the motor, may damage the wheel, and will overheat the workpiece. Using too little pressure will prevent sufficient contact with the wheel. -17 6. Depending on the type of metal, you may need to regularly dip the workpiece into the water cup to cool it off. For heat-intensive work, direct a stream of water onto the workpiece and grinding wheel with the flexible water pipe. The flow of water can be increased or decreased using the red valve just below the water cup. If the water supply is exhausted, stop grinding and refill the water cup. Wheel Care A large part of your safety while grinding depends on the condition of the grinding wheel. A wheel in poor condition may break apart during rotation, causing serious injury. To properly care for your wheel, follow these tips: • Always transport, store and handle wheels with care. Wheels may be damaged if dropped or if heavy objects are stacked on them. • Select the right grinding wheel for both the job and the machine. DO NOT grind material that is not designed for the wheel. A machine that rotates at a higher RPM than the wheel is rated for may cause the wheel to fly apart. • Mount the wheels properly. (See the "Replacing Wheels" instructions on Page 19 for guidance.) Never use a wheel with the wrong arbor size for the grinder. • DO NOT abuse the wheel by jamming the workpiece into the grinding wheel with excessive force. This can cause irreparable damage to the wheel. • Learn how to use the grinder and the grinding wheels properly. Ask a trusted person with experience or consult with your local library to learn more. • Dress the grinding wheel when the surface loses its abrasive quality or becomes unbalanced. Wheel Dressing Dressing restores the grinding wheel with a like- new abrasive quality. Whenever the front surface of the wheel loses its abrasive qualities or balance due to particle loading or polishing of the wheel surface, then the wheel should be dressed. Use a commercially-available dressing tool, such as those available on Page 21. To dress the grinding wheel: 1. With the machine plugged into power, stand to the side of the grinding wheel and move the switch to the ON position. 2. Allow the machine to run for at least one full minute to make sure that the grinding wheel is safe to use, then move to the front of the machine. 3. Hold the dressing tool firmly on the tool rest with both hands and press it lightly against the front surface of the grinding wheel. 4. Move the dressing tool in a side-to-side motion, while keeping it even with the surface of the grinding wheel. 5. Regularly pull the dressing tool away from the wheel for visual inspection and repeat Steps 3 & 4 until the surface of the wheel appears to be restored to its normal color and balance. -18 H7762 Heavy Duty Tool Grinder Wheel Selection The Model H7762 only accepts Type 50 wheels with a 11.4" bore. Aluminum oxide and silicon carbide wheels are marked in a somewhat uniform manner by all major manufacturers. Understanding these markings will help you understand the capabilities of various wheels. Always refer to the manufacturer’s grinding recommendations when selecting a wheel for your project. The basic format for wheel numbering is: Prefix Abrasive Type Grit Size Grade Type Bond Type Type 1 A 60 L V The Prefix is the manufacturer’s designation for a particular type. The most common Abrasive Types used are A for Aluminum Oxide and C for Silicon Carbide, and occasionally SG for Seeded...