The document describes the Delta Universal Wet/Dry Grinder (Model 23-700), an instruction manual detailing its assembly, operation, and maintenance. This versatile machine is designed for sharpening and honing various cutting tools, offering both dry grinding for faster material removal and wet grinding for cooler, more precise work and fine edges.
Function Description:
The Delta Universal Wet/Dry Grinder serves as a dual-purpose sharpening tool. It features two grinding wheels: a 5-inch diameter aluminum oxide dry grinding wheel and a 10-inch diameter aluminum oxide wet grinding wheel. The dry grinding wheel operates at a high speed (3450 RPM) and is suitable for quickly shaping and pointing tools like screwdrivers, scissors, putty knives, wood chisels, and drill bits. The wet grinding wheel operates at a much slower speed (70 RPM) and is designed for honing cutting tools such as garden tools, chisels, and axes, providing a cooler grinding action that prevents damage to the temper of hardened tools and helps remove burrs for keen edges. The wet grinding process involves submerging the lower portion of the wheel in a water reservoir, which keeps the wheel constantly wet during rotation.
Important Technical Specifications:
- Model Number: 23-700
- Part Number: 1340208
- Motor: 1/5 H.P.
- Voltage: 120 Volts
- Amps: 2 Amps
- Phase: Single Phase
- Frequency: 60 Hz
- 5-inch Dry Grinding Wheel Speed: 3450 RPM (replacement wheels should be rated for 3450 RPM or higher)
- 10-inch Wet Grinding Wheel Speed: 70 RPM
- Grinding Wheel Material: Aluminum Oxide
- Tool Rest Adjustment: Maintain 1/8" or less separation from the wheel.
- Electrical Connection: 3-prong grounding type plug, 3-wire extension cords (12-gauge for up to 100 feet, 10-gauge for up to 150 feet), 20 Amp time lag fuse.
- Wet Grinding Water Level: One inch of the lower portion of the 10-inch grinding wheel submerged in water.
Usage Features:
- Dual Grinding Capability: Allows for both fast material removal (dry) and precise, cool honing (wet).
- Adjustable Eye Shield: Provides operator safety by protecting against sparks and debris. It is fully adjustable to any desired position.
- Adjustable Tool Rests: Both grinding wheels are equipped with adjustable tool rests. The dry grinding wheel's tool rest can be positioned close to the wheel and slightly below its center for general work. The wet grinding wheel's tool rest is highly adjustable, allowing for precise positioning close to the wheel and at various angles, including compound angles up to 45° (right or left) when used with the sliding angle jig. The locking handles for the wet grinding tool rest are spring-loaded for easy repositioning.
- Adjustable Spark Deflector: Located on the dry grinding side, it can be adjusted downward as the wheel wears to maintain maximum operator safety.
- Sliding Angle Jig: A specialized accessory for the 10-inch wet grinding wheel, facilitating accurate grinding of compound angles.
- Water Reservoir and Drain: The base for the wet grinding wheel includes a water reservoir to keep the wheel wet and a drain screw for easy water removal.
- Power Switch: A clearly marked "ON/OFF" switch is located under the motor. It features two holes for a padlock, allowing the user to lock the switch in the "OFF" position for safety when not in use.
- Mounting Holes: The grinder base has four mounting holes to securely fasten the machine to a supporting surface, ensuring stability during operation.
Maintenance Features:
- Grinding Wheel Dressing: Regular dressing of the grinding wheels with a silicon carbide stick type dresser is recommended to maintain proper shape, balance, and grinding results. This ensures the wheel face is clean and corners are square.
- Grinding Wheel Replacement: Instructions are provided for safely changing both the 5-inch and 10-inch grinding wheels. This involves removing guards, tool rests, side covers, and arbor nuts. Users are cautioned not to overtighten the arbor nuts during installation.
- Lubrication:
- The arbor shaft should be occasionally lubricated with light machine oil through the provided oiler.
- The worm gears (for the wet grinding wheel's slow speed mechanism) require grease application after removing the nameplate.
- Cleanliness: Keeping the work area clean is emphasized as a safety rule.
- Inspection: Regular inspection of wheels for cracks or chips, and checking for damaged parts (guards, etc.) is crucial for safe operation.
- Water Level Management: For the wet grinding wheel, maintaining the correct water level in the reservoir is essential, and additional water should be added as it is absorbed by the wheel.
- Bearing Maintenance: If a wheel vibrates excessively, dressing the wheel, replacing it, or replacing the shaft bearings may be necessary.
The manual also includes extensive safety rules, emphasizing the importance of reading the manual, wearing eye protection, grounding the tool, keeping guards in place, maintaining a clean work area, and disconnecting power before servicing. It specifically warns against using damaged wheels, forcing the tool, and operating it under the influence of drugs or alcohol.
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