The ACE Hardware 6" Bench Grinder (Model #7065, ACE 27201) is a dual-light power tool designed for various grinding and sharpening tasks. This owner's manual provides comprehensive instructions for its safe operation, assembly, and maintenance, emphasizing the importance of user safety and proper tool care.
Function Description:
The bench grinder is primarily used for sharpening tools such as scissors, knives, screwdrivers, twist drill bits, and lawn mower blades, as well as for general grinding and material removal. It features two grinding wheels, allowing for different grinding applications simultaneously. The "Dual Light" feature, incorporating two work lights, enhances visibility of the workpiece, improving precision and safety during operation. The grinding wheels rotate at a specified "NO LOAD" RPM, which is marked on the grinder's nameplate, ensuring efficient material removal.
Important Technical Specifications:
- Wheel Diameter: 6 inches
- Center Hole: 5/8 inches
- Maximum Wheel Width: 1 inch (for 8" diameter wheels, though this model is 6")
- Power Source: 110-120V, requiring a properly grounded 3-prong outlet.
- Circuit Protection: Protected by a 14 amp time delay or Circuit Saver fuse or circuit breaker.
- Grounding: Equipped with an equipment grounding conductor for electrical shock protection.
- Extension Cords: Requires 3-wire, 3-prong grounding type UL Listed extension cords. The manual provides a detailed ampere rating and AWG (American Wire Gauge) chart for appropriate cord selection based on length and voltage (120V and 240V, though the product is 110-120V). For example, for 120V and 6-10 Ampere Rating, a 25 ft cord requires 18 AWG, while a 200 ft cord requires 12 AWG.
- Grinding Wheels: Comes with two grinding wheels (60# and 36# grit are listed in the parts diagram), and the manual specifies that replacement wheels must have a safe rated speed at least as high as the "NO LOAD" RPM on the nameplate.
Usage Features:
- Tool Rests: Adjustable tool rests are provided to support the workpiece during grinding. They must be adjusted to maintain 1/16" or less separation from the grinding wheel. There are specific left and right tool rests for correct installation.
- Spark Guards: Two spark guards are included to protect the operator from sparks and debris. These are also adjustable to within 1/16" of the grinding wheel.
- Eye Shields: Two paper-covered eye shields, mounted on adjustable brackets with work lights, offer additional eye protection. These shields should be positioned horizontally and slightly above the eye shield when in grinding position. The hex nuts on the eye shields should be on the back side, away from the operator.
- Work Lights: The "Dual Light" feature provides illumination for the workpiece, improving visibility and precision. The lights are integrated into the eye shield brackets.
- Switch: A rocker switch located on the front of the grinder controls power, with "ON" and "OFF" positions.
- Workpiece Handling: The manual advises maintaining a steady, moderate pressure and consistent movement of the workpiece to prevent overheating and premature wear of the grinding wheels. It also suggests dipping the workpiece in water regularly to prevent overheating, which can weaken metals.
- Sharpening Techniques: Specific guidance is provided for sharpening various tools:
- Scissors: Remove material from the outside surface, working from the heavy end toward the tip.
- Knives: Remove metal from both faces, working from the heavy end toward the tip.
- Screwdrivers: Grind the end to a perfect rectangle, flat and perpendicular to the center line of the shank, with tapering sides and faces.
- Twist Drill Bits: Sharpen on one side of the point at the existing angle, twisting the bit while maintaining a constant angle. One tool rest has a V-groove for drill bits.
- Lawn Mower Blades: Sharpen on one side and dress up slightly on the other, then balance the blade.
- Safety Rules: Emphasizes reading the owner's manual, inspecting for damage, securing the grinder, using in a dry and well-lit environment, disconnecting power before servicing, planning ahead, keeping guards in place, avoiding accidental starting, using the right tool, wearing proper apparel (protective hair covering, no loose clothing/jewelry, rubber-soled footwear), wearing gloves, and using safety glasses/face mask.
Maintenance Features:
- Wheel Inspection: Regular inspection of grinding wheels for cracks, grooves, rounding, chips, or foreign material is crucial. Cracked wheels must be replaced immediately.
- Wheel Dressing: Grooved, rounded, chipped, or loaded wheels can be remedied with a dressing tool (available at hardware stores). New wheels may also require dressing to make them round.
- Wheel Replacement: When replacing a wheel, ensure it has a safe rated speed, a 5/8" center hole, and a maximum width of 1" (for 8" wheels). The tool must be unplugged before attempting repairs.
- Cleaning: Frequently clean grinding dust from beneath the grinder to maintain performance and safety.
- General Care: Keep the grinder clean for best and safest performance.
- Cord Inspection: If the power cord is worn, cut, or damaged, it must be replaced immediately.
- Troubleshooting: If the grinder makes unfamiliar noises or vibrates excessively, stop immediately, turn off, unplug, and do not restart until the problem is corrected.
- Accessory Use: The grinder accepts most polishing and buffing wheels available at dealers and hardware stores. However, the manual warns against using any other accessories not recommended, as it may result in serious injury.
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