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Figure 6. Tool rest and eye shield assembly. NEVER assemble a grinding wheel on the arbor without paper or fiber discs between the wheel and the mount- ing flange. Omitting the discs can put undue stress on the wheel, causing it to crack and possibly fly apart. Figure 7. Grinding wheel installation order. SET UP -9 M1104, M1105, M1106 Heavy-Duty Bench Grinder Test Run SET UP Once your machine is mounted and assembled, you should perform a test run to make sure it works properly. To perform a test run, do these steps: 1. Make sure all tools are removed from the grinder area. 2. Make sure the switch is in the OFF position. 3. Plug the grinder into the power source. 4. Turn the grinder ON. Under normal conditions, the grinder will make a humming noise, with only minor vibration. — If you suspect any problems, immediately turn the grinder OFF and refer to Page 15 to troubleshoot and correct any problems before starting the grinder again. — If the source of an unusual noise or vibration is not readily apparent, contact our technical support for help at (360) 734-3482 or contact us online at tech-support@shopfox.biz. DO NOT investigate problems or adjust the Heavy-Duty Bench Grinder while it is running. Wait until the machine is turned OFF, unplugged and the spindle has come to a complete stop before proceeding! -10 M1104, M1105, M1106 Heavy-Duty Bench Grinder OPERATIONS General Your bench grinder will allow you to perform many types of grinding and buffing operations. However, the following section is not a complete guide for every possible use. We strongly recommend that you read books, trade magazines, or seek formal training before attempting any grinding or buffing operations in which you are not confident with. Above all, your safety should come first. This recommended research will pay off with increased safety, improved work results, and the knowledge to be a better metalworker. Grinding Operations NEVER grind non ferrous metals like aluminum, brass, copper, bronze, and others, or the grinding wheel will load up, overheat, and can explode dur- ing operation. Once the assembly and the test run have been completed, your Heavy-Duty Bench Grinder is ready for use. When mounting a new wheel, or when there is any concern about wheel integrity, stand away from the line of rotation of the wheel and then turn the grinder ON. Allow the grinder operate for one minute. If there is a problem it will generally occur when the grinder is first started. If the grinding wheel is OK, rest the workpiece on the tool rest and ease the workpiece into the grinding wheel. Begin grinding without holding the workpiece in one spot or it will cause uneven wear on the stone face. Operation of this equipment has the potential to propel debris into the air which can cause eye injury. Always wear safety glasses or goggles when operating a grinder. Everyday glasses or reading glasses are not safety glass- es. Be certain the safety glasses you wear meet the appropriate standards of the American National Standards Institute (ANSI). DO NOT make adjustments while the grinder is running. Ensure that the switch is OFF, power is disconnected and moving parts have stopped before making adjustments. Failure to comply could result in serious injury or electrical shock hazard. OPERATIONS -11 M1104, M1105, M1106 Heavy-Duty Bench Grinder Wheel Selection Aluminum oxide and silicon carbide wheels are marked in a somewhat uniform manner by all the 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: DO NOT use this grinder with a liquid cooling system required for wet grind- ing wheel operations. Ignoring this warning can lead to electrocution. Prefix..Type Abrasive..Type Grit..Type Grade Bond..Type 36 A 60 L V The most common abrasive types used are A for Aluminum Oxide and C for Silicon Carbide, and occasionally SG for seeded gel. The prefix is the manufacturer’s designation for a particular type. The grit size is a number referring to the size of the abrasive grain in the wheel. The lower the number the coarser the wheel—10 is a very coarse wheel for roughing and 220 is usually the upper range for fine finish work. Grade is an indication of the hardness of the wheel, with A being softest to Z the hardest. Bond type refers to the type of bonding material used to hold the abrasive material. Most general purpose wheels will have a V indicating vitrified clay is used, providing a high strength and good porosity. The other most common 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. OPERATIONS -12 M1104, M1105, M1106 Heavy-Duty Bench Grinder Ch...

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