This document is an operating and maintenance manual for a Clarke Right Angle Die Grinder, Model No: CAT143.
Function Description
The Clarke CAT143 Right Angle Die Grinder is an air-powered tool designed for light tasks such as automotive porting and polishing applications. It uses various grinding stones, which are secured in a collet, to perform abrasive work. The tool's right-angle drive allows for access to confined spaces. It operates by compressed air and features adjustable speed control and an exhaust deflector for user convenience and safety.
Important Technical Specifications
- Model Number: CAT143
- Dimensions (L x W x H): 176 x 100 x 44 mm
- Weight: 0.7 kg
- Air Inlet Size: 1/4" BSP (female)
- Operating Pressure: 90 psi (6.2 bar)
- Air Consumption: 15 cfm at max load
- No Load Speed: 20000 rpm @ 90psi
- Sound Pressure Level (LpA dB): 88 dB(A)
- Sound Power Level (LwA dB): 99 dB(A)
- Vibration Levels: 2.9 m/s²
- Speed Settings: 8000, 11500, 17500, or 20000 rpm (+/- 10%)
- Collets: Supplied with 1/4", 6 mm, and 1/8" collets.
Usage Features
The die grinder is designed for ease of use and safety, with several key features:
- Collet Installation: The tool comes with three collets (1/4", 6 mm, 1/8") to accommodate different grinding stone shank sizes. To install a collet, the screw cap is undone, the desired collet is placed in the collet seat, and the cap is loosely screwed back on.
- Grinding Stone Fitting: After selecting the appropriate collet, the shank of the grinding stone is inserted into the collet, and the screw cap is finger-tightened. Two collet wrenches are provided: a smaller one to hold the collet seat stationary and a larger one to fully tighten the collet, securing the stone. It is crucial to never use chipped or cracked grindstones.
- Speed Adjustment: The tool's speed can be adjusted by rotating a control dial, offering four distinct settings: 8000, 11500, 17500, or 20000 rpm (with a +/- 10% tolerance). The chosen speed setting aligns with a reference mark on the air inlet.
- Operation: To operate, the user slides the throttle locking lever forward while squeezing the trigger. The tool should not be used with excessive pressure on the grinding stone, as this can shorten its life. Releasing the trigger stops the grinder, though it will continue to rotate for a short time. Users are advised to ensure the grinder has fully stopped before setting it down.
- Exhaust Deflector: The tool includes an adjustable exhaust deflector. This sleeve can be twisted to direct the exhaust air away from the workpiece or the operator, enhancing comfort and safety.
- Air Supply Connection: Before use, the blanking plug is removed from the air inlet. An in-line mini oiler can be connected to prolong tool life; if not used, a few drops of oil should be run through the tool before use. A suitable air hose is then connected to the air inlet and to the compressor.
- Disconnection and Storage: To disconnect, the air supply hose should not be removed until the compressor is shut down and compressed air is released. After pressure is released, the hose can be disconnected. For storage, especially if idle for more than 24 hours, a few drops of Clarke air line oil should be run into the air inlet, and the tool operated for 5 seconds to lubricate internal parts. The tool should be cleaned, disconnected from the air supply, and stored in a dry, safe place, with the blanking plug replaced on the airline connector.
Maintenance Features
Regular maintenance is essential for the longevity and optimal performance of the die grinder:
- Daily Maintenance:
- Drain water from the air tank, air line, and compressor before each use.
- Pour a few drops of CLARKE airline oil into the air inlet. This should be done regardless of whether an in-line mini oiler is used. If no mini oiler is present, this procedure should be repeated every two to three hours of use.
- Weekly Maintenance:
- Check the air inlet screen filter for blockages and clean it if necessary.
- Cleaning:
- Keep the tool body clean and free from debris.
- Grit or gum deposits can reduce efficiency. This can be remedied by cleaning the air strainer and flushing the tool with gum solvent or oil. For more severe cases, motor dismantling may be required, which should be handled by a Clarke dealer.
- Greasing:
- The right-angle drive is equipped with a grease nipple for lubricating the drive gears. After extensive use, apply general-purpose grease using a suitable grease gun.
- Service and Repair:
- If the tool operates erratically or inefficiently despite a good air supply, it may require dismantling of the air motor and replacement of worn or damaged parts. This servicing should be performed by a qualified service technician.
- Factors such as reduced compressor output, excessive moisture in the airline, or improper connectors can affect tool performance. Clarke Air Line Oil (part no. 3050825) is available from Clarke dealers.
Safety Precautions
The manual emphasizes several safety rules:
- Always wear eye and ear protection when using the tool.
- Wear a dust mask.
- Keep the work area clean and tidy.
- Dress appropriately, avoiding loose clothing or jewelry, and tie back long hair.
- Do not operate the tool when tired or under the influence of substances.
- Never use oxygen, CO2, combustible gases, or bottled gas as a power source.
- Do not connect the air supply hose with a finger on the trigger.
- Do not exceed the maximum operating pressure of 90 psi / 6.2 bar.
- Check hoses for leaks or wear before use.
- Disconnect from the air supply during maintenance, when not in use, or when moving the tool.
- Never use a defective or abnormally operating tool.
- Avoid damaging the tool with excessive force.
- Do not remove or damage labels.
- Be aware of vibration; stop using the tool if discomfort or pain occurs.
- Do not carry the tool by the air supply hose or with a finger on the trigger.
- Store the tool in a dry place, out of reach of children, and avoid temperatures below 0°C.
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