The Makita Sharpener Model 9820-2 is a power tool designed for sharpening blades and knives, featuring a 200 mm (7-7/8") grinding wheel. This instruction manual provides comprehensive details on its operation, safety precautions, and maintenance.
Function Description:
The sharpener is primarily used for maintaining sharp edges on various cutting tools, including planer blades and knives. It operates by rotating a grinding wheel against the cutting edge of the workpiece, with adjustable settings to achieve the desired sharpening angle and finish. A key feature is its integrated coolant reservoir and flow system, which helps to cool the workpiece and wash away debris during operation, preventing overheating and ensuring a cleaner grind. The sharpening platform guide (rail) and sharpening holder are designed to securely hold the workpiece and facilitate precise angle adjustments, ensuring consistent and effective sharpening.
Important Technical Specifications:
- Wheel size: 200 mm x 25 mm x 75 mm (7-7/8" x 1" x 3")
- No load speed: 560 R/min.
- Overall length: 390 mm (15-3/8″)
- Net weight: 11 kg (24.3 lbs)
- Grinding wheel grits available: 1000, 6000, 60 (Part Nos. 741070-7, 741071-5, 741074-9 respectively)
Usage Features:
The sharpener is designed with several user-friendly features to ensure safe and effective operation:
- Grinding Wheel Replacement: The grinding wheel can be easily replaced using the provided wrench. The installation screw is turned counterclockwise to release the wheel and clockwise to secure a new one.
- Wheel Guard Adjustment: The wheel guard's height is adjustable, with the top of the guard recommended to be approximately 1 mm (1/3") below the grinding wheel surface. This adjustment is made by turning the guard clockwise to lower it or counterclockwise to raise it.
- Antirust Wiping: Before use, the sharpening platform guide (rail) and sharpening holder should be wiped clean of antirust coating and then coated with machine oil or spindle oil to ensure smooth operation.
- Sharpening Platform Guide Removal/Installation: The sharpening platform guide can be removed by loosening a screw and slipping a set plate aside, facilitating cleaning or maintenance.
- Adjusting Sharpening Platform Guide: For sharpening blades/knives, the angle adjustment screw allows for precise control over the sharpening angle. Turning the screw clockwise makes the bevel more acute. The platform poles are secured by tightening fastening screws on either side.
- Pole Height Adjustment: The pole height can be adjusted by turning a nut. Each clockwise graduation raises the pole by 0.5 mm (1/32"), while counterclockwise turns lower it by the same amount.
- Blade/Knife Sharpening: The sharpening platform guide can be tilted slightly downward on the right side to ensure the blade contacts the grinding wheel surface correctly. The sharpening holder's horizontal (forward) adjust screws allow for proper blade insertion and contact with the blade fastening screws.
- Coolant Reservoir Installation: The coolant reservoir (tank) is installed by inserting its legs into grooves on the sharpener frame.
- Coolant Flow Adjustment: Water is added to the reservoir, and the coolant flow is controlled by turning a knob. A vertical marking indicates flow, while a horizontal marking stops it. Adequate flow is crucial to wash away debris without being excessive.
- Used Coolant Draining: The sharpener includes a drain hose (vinyl tube) for convenient draining of used coolant into a pan or drain system.
- Switch Action: The tool is started by pressing the "ON" side of the switch and turned off by pressing the "OFF" side.
- Sharpening Technique: When sharpening, the cutting edge should be moved away from the user, holding the sharpening holder with both hands. The holder is slid back and forth on the sharpening platform guide at approximately ten times per minute, applying uniform pressure (about 5 kg or 11 lbs). It is crucial to always use the sharpening platform guide or guide assembly (optional accessory) for blade/knife sharpening. To create a better cutting edge, some stock should be removed from the tip to the heel, relative to the original grinding angle.
- Planer Blade Sharpening: Planer blades should be sharpened to a 40° angle.
Maintenance Features:
Regular maintenance is essential for the sharpener's safety and reliability:
- Safety First: Always ensure the tool is switched off and unplugged before performing any inspection or maintenance.
- Cleaning and Drying: After operation, the tool should be cleaned and dried.
- Post-Operation Check: Before moving the tool, confirm it is switched off, unplugged, and drained.
- Genuine Parts: For repairs, maintenance, and adjustments, only Makita Authorized or Factory Service Centers should be used, and genuine Makita replacement parts must be utilized to maintain product safety and reliability.
- Wheel Inspection: The grinding wheel should be carefully checked for cracks or damage before each operation and replaced immediately if any are found.
- Spindle/Bolt Protection: Care must be taken not to damage the spindle, bolt, or the wheel itself, as this could lead to breakage.
- Storage: Grinding wheels should always be stored in a dry location to prevent freezing and cracking in cold weather.
The manual emphasizes a comprehensive set of safety rules, including:
- Knowing Your Power Tool: Read the owner's manual thoroughly to understand applications, limitations, and potential hazards.
- Guards in Place: Ensure all guards are in place and functioning correctly.
- Remove Adjusting Tools: Always remove adjusting keys and wrenches before turning on the tool.
- Clean Work Area: Maintain a clean and uncluttered workspace.
- Environment: Avoid using power tools in damp/wet locations or exposing them to rain. Ensure the work area is well-lit.
- Child Safety: Keep children and visitors at a safe distance. Make the workshop kid-proof with padlocks or master switches.
- Don't Force Tool: Allow the tool to work at its designed rate.
- Use Right Tool: Use the tool only for its intended purpose.
- Proper Apparel: Wear no loose clothing, gloves, neckties, rings, bracelets, or other jewelry. Use non-slip footwear and protective hair covering.
- Safety Glasses/Mask: Always wear safety glasses. Use a face or dust mask if the operation is dusty.
- Secure Work: Use clamps or a vise to hold work when practical.
- Avoid Overreaching: Maintain proper footing and balance.
- Tool Maintenance: Keep tools sharp and clean, and follow lubrication/accessory change instructions.
- Disconnect Tools: Disconnect tools before servicing or changing accessories.
- Prevent Unintentional Starting: Ensure the switch is in the "off" position before plugging in.
- Recommended Accessories: Use only accessories recommended in the owner's manual.
- Never Stand on Tool: Avoid serious injury by not standing on the tool.
- Check Damaged Parts: Inspect damaged guards or parts before further use and repair/replace as necessary.
- Direction of Feed: Feed work against the direction of rotation.
- Never Leave Running Unattended: Turn power off and wait for the tool to stop completely.
- Proper Grounding: The tool should be grounded to protect against electric shock, using a three-wire extension cord with a grounding-type plug and receptacle.
- Voltage Warning: Ensure the power source voltage matches the tool's nameplate specification to prevent serious injury or damage.
Additional Safety Rules (Specific to Grinders):
- Wheel Speed: Use wheels with a maximum operating speed at least as high as the "No Load RPM" marked on the tool's nameplate.
- Wheel Security: Secure the wheel carefully.
- Clearance: Maintain a 5 mm (3/16") space between the sharpening platform guide (rail) and the grinding wheel.
- Hand Safety: Keep hands away from rotating parts.
- Workpiece Contact: Ensure the workpiece is not contacting the wheel before turning on the switch.
- Initial Run: Let the tool run for several minutes before using it on a workpiece to check for flutter.
- Wheel Surface: Use only the upper surface of the wheel, not the side surface.
- Abnormal Operation: Immediately switch off the tool if the wheel stops, makes an odd noise, or vibrates.
- Complete Stop: Always wait for the wheel to come to a complete stop before making adjustments or inspections.
- Hot Workpiece: Do not touch the workpiece immediately after operation, as it may be extremely hot.
- Dry Wheel: Idle the tool after operation to dry the wheel and prevent cracking from freezing in cold weather.
- Eye Protection: Wear eye protection.
- Grinding Wheel Suitability: Use a grinding wheel suitable for the grinder's speed.
- Guards and Eye Shields: Always use guards and eye shields.
- Wheel Nut: Do not overtighten the wheel nut.
- Flanges: Use only flanges furnished with the grinder.
The Makita Sharpener Model 9820-2 is a robust and precise tool, designed for efficient and safe sharpening, provided all instructions and safety precautions are diligently followed.
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