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Resumen del manual
Most general purpose wheels will have a “V” indicating Vitrified Clay is used. Vitrified Clay provides high strength and good porosity. The other common bond type is “B” for resin where synthetic resins are used. These are used to grind cemented carbide and ceramic materials. There may be other numbers inserted that have meaning for a particular type of wheel. Refer to the manufacturer’s technical data for a complete explanation. H4378/H4379 Slimline Bench Grinder -11 Wheel Inspection Before mounting a new grinding wheel, it must be inspected. Do not assume that a wheel is in sound condition just because it is new—often, damage can occur in shipping, with age, or with exposure to moisture. First, the wheel should be given a Visual Inspection. Look for any cracks, chips, nicks or dents in the surface of the wheel. If you see any of these, DO NOT use the wheel. Second, the wheel should be given a Ring Test. This test will give you an indication of any internal damage that may not be obvious during a visual inspection. To perform a Ring Test: 1. Make sure the wheel that you test is clean and dry; otherwise, you may get false results. 2. If size permits, balance the wheel with your finger in the hole. If this is not possible, hang the wheel in the air with a piece of cord or string looped through the hole in the center. 3. At the spots shown in Figure 2, gently tap the wheel with a light non-metallic device such as the handle of a screwdriver or a wooden mallet. Figure 2. Ring test tapping locations. 4. An undamaged wheel will emit a clear metallic ring or “ping” sound in each of these spots. A damaged wheel will respond with a dull thud that has no clear tone. 5. If you determine from the ring test that the wheel is damaged, DO NOT use it! -12- H4378/H4379 Slimline Bench Grinder H4378/H4379 Slimline Bench Grinder -13- NEVER assemble a grinding wheel on the arbor without paper or fiber discs between the wheel and the flange. Omitting the discs can put undue stress on the wheel, causing it to crack and possibly fall apart. ALWAYS visually inspect and perform a “ring test” on a wheel before assembly. DO NOT use damaged wheels! Wheel Mounting The wheel guard assembly must be removed in order to mount or dismount a grinding wheel. To do this: 1. Disconnect the grinder from the power supply! 2. Remove the 3 Phillips head screws and nuts that go through the outer guard. Take off the outer guard and the rim guard. 3. Use a wrench on the nut that holds the wheel on the arbor. Hold the wheel from turning with your other hand. Note that the wheel on the left-hand side of the machine is a lefthanded thread, so loosening it will require turning it clockwise. 4. Remove the outer wheel flange and the paper disc. Pull the wheel free from the arbor. There will also be a paper disc and a wheel flange on the back side of the wheel. 5. Mount the new wheel in the reverse order or as shown in Figure 3. Always make certain there is a paper or fiber disc between the wheel flanges and the wheel itself. Tighten the nut snugly but DO NOT over-tighten. Over-tightening can crack the wheel. 6. Re-install the guards and shields. 7. Run a new wheel for at least 1-2 minutes while standing clear of the line of rotation. If a wheel does have defects it will generally fail as soon as it gets up to full speed. 3500 RPM Aluminumn Oxide Type-1 Vitrified Bond Figure 3. Wheel mounting order. Flange Flange Nut Wheel Paper/Fiber Disc Paper/Fiber Disc SECTION 6: MAINTENANCE General Disconnect power to the machine when perform- ing any maintenance, assembly or adjust- ments. Failure to do this may result in serious personal injury. ! Always be aware of the condition of your grinder. Routinely check the condition of the following items and repair or replace as necessary: • Loose mounting bolts • Worn switch • Worn or damaged cord • Worn or damaged support bearings or guide bearings • Damaged grinding wheel • Any other condition that could hamper the safe operation of this machine. NOTICE If the grinder is unmounted from the workbench for maintenance, the cooling tray can be easily damaged if the grinder is tipped forward. Lubrication Sealed and pre-lubricated ball bearings require no lubrication for the life of the bearings. All bearings are standard sizes, and replacements can be purchased from our parts department or a bearing supply store. Grinding Wheels The grinding wheel should be inspected before every use. Use the “ring test” method from page 12 “Wheel Mounting” instructions to verify the structural integrity. If using coolant during grinding, always run the wheel for 5-10 minutes at the end of the operation to remove any coolant from the wheel. Take care in storing grinding wheels to keep them free from potential damage by being dropped or having other items dropped on them. Replace the wheel when the wheel diameter is reduced to 4" on the Model H4378 and 6" on the Model H4379. Operating at anything less than this diameter does not allow the prop...
Otros modelos de este manual:Máquinas de rectificar - H4378 (2.14 mb)