This document describes the Masterforce 5/8" Drill/Mixer, a versatile power tool designed for drilling and mixing applications. The manual provides comprehensive instructions for safe operation, assembly, and maintenance, ensuring users can effectively utilize the tool while minimizing risks.

Function Description

The Masterforce 5/8" Drill/Mixer is primarily designed for drilling holes in various materials and for mixing substances. Its robust construction and powerful motor make it suitable for both light-duty and heavy-duty tasks. The drill features a 5/8" keyed chuck, allowing for secure attachment of a wide range of drill bits and mixing accessories.

A key functional aspect of this tool is its variable-speed ON/OFF trigger switch, which allows for precise control over the rotational speed. This is particularly useful when working with different materials or when performing tasks that require varying levels of power and speed, such as starting a hole or mixing viscous liquids. The variable speed functionality is further enhanced by a speed control dial, which enables users to pre-set a desired RPM. This feature is especially beneficial for prolonged operations where a consistent speed is required, or for tasks that demand specific speed settings for optimal results.

The drill also incorporates a forward/reverse switch, conveniently located above the trigger switch. This allows the user to easily change the direction of rotation, which is essential for removing drill bits from a workpiece, backing out screws, or for specific mixing applications. The ability to reverse direction adds to the tool's versatility, making it suitable for both driving and removing fasteners, as well as for various mixing techniques.

For extended operations, the drill is equipped with a lock-on switch. This feature allows the user to lock the ON/OFF switch in the ON position, eliminating the need to continuously hold down the trigger. This reduces user fatigue during prolonged drilling or mixing tasks, improving comfort and control. To disengage the lock-on feature and turn off the drill, the user simply squeezes and releases the trigger switch.

The tool's design emphasizes user control and safety. It includes an auxiliary handle and a swiveling "D" handle, both of which are crucial for providing additional control and stability during heavy drilling or mixing operations. These handles allow for a firm, two-handed grip, which is vital for managing the torque generated by the drill, especially when working with larger bits or dense materials.

Usage Features

Before using the drill, users are instructed to read and understand the entire manual, including all safety rules and operating instructions. This ensures familiarity with the tool's applications, limitations, and potential hazards.

Assembly and Operation:

Handle Installation: The auxiliary handle and swiveling "D" handle must be installed to provide additional control. The "D" handle is secured with a screw and an Allen key, while the auxiliary handle is threaded clockwise into a designated hole. Hand tightening is sufficient for the auxiliary handle.
Forward/Reverse Switch: To rotate the drill clockwise (for drilling), the switch is pushed to the left. To rotate counter-clockwise (for removing bits or screws), the switch is pushed to the right. It is critical not to change the switch position while the chuck is turning. The trigger switch will not function if the forward/reverse switch is in the middle or "neutral" position.
Variable Speed Control: The trigger switch allows for variable speed operation. A gentle squeeze starts the drill at its slowest speed, while fully depressing the trigger achieves the fastest speed. The speed control dial allows pre-setting a desired RPM, which is engaged when the lock-on button is used.
Lock-on Switch: For prolonged operation, the lock-on switch can be engaged by squeezing the trigger and pressing the lock-on button. To turn off the drill, squeeze and release the trigger.
Installing Drill Bits: Before installing any bit, the drill must be unplugged from the power source. The chuck collar is rotated to open the jaws, and the bit is inserted fully into the jaws. The chuck key is then used to firmly tighten the bit by rotating it clockwise. It is crucial to ensure the bit is properly centered and held by all three chuck jaws to prevent it from being thrown from the chuck during operation.
Removing Bits: Similar to installation, the drill must be unplugged. The chuck key is used to rotate counter-clockwise, releasing the bit.
Drilling: When drilling in hard surfaces, a center punch should be used to mark the hole location to prevent the drill bit from slipping. The workpiece should be secured with a vise or clamps. Users should hold the drill firmly with both hands, using the main handle and the auxiliary or "D" handle. Pressure should be applied only enough to keep the bit cutting, avoiding excessive force or sideways pressure. Higher speeds are recommended for small holes, and slower speeds for large holes.
Driving Screws: The correct screwdriver bit must be selected and fastened securely into the chuck. Slower speeds are recommended for soft or porous materials to avoid over-driving screws. A firm, two-handed grip is essential to maintain control.
Chuck Removal: The chuck can be removed for specific accessories. After unplugging the tool, a 5/16" or larger hex key is inserted into the chuck and tightened. Tapping the hex key sharply with a mallet in a CLOCKWISE direction loosens the internal screw. The chuck screw, which has a left-hand thread, is then removed using a #2 screwdriver (turning CLOCKWISE to remove). Finally, the hex key is reinserted, tightened, and tapped sharply with a mallet in a COUNTER-CLOCKWISE direction to loosen the chuck from the spindle, allowing it to be unscrewed by hand.
Retightening a Loose Chuck: If the chuck becomes loose or wobbly, it can be retightened. A hex key is inserted and tightened in the chuck, then tapped sharply with a mallet in a CLOCKWISE direction to tighten it on the spindle. The chuck screw is then tightened using a #2 screwdriver (turning COUNTER-CLOCKWISE to tighten, as it has a left-hand thread).

Maintenance Features

Proper maintenance is crucial for the longevity and safe operation of the Masterforce 5/8" Drill/Mixer. The manual outlines specific maintenance procedures and general care guidelines.

Replacing Carbon Motor Brushes: Carbon motor brushes wear down over time and require replacement. The frequency of replacement depends on usage, but it is recommended to check them after every 10 hours of use. Brushes should be replaced when their length reaches 1/4" (6.35 mm). To replace, the tool must be unplugged. A 3/16" (5 mm) slot screwdriver is used to remove the brush cap by turning it counter-clockwise. The spring and brush assembly are then pulled out. A new assembly is inserted, the spring compressed, and the brush cap threaded back in (ensuring not to cross-thread or overtighten). This process is repeated for the brush on the opposite side of the motor housing.
General Maintenance: When servicing, only identical replacement parts should be used to avoid creating safety hazards or product damage. Solvents should not be used for cleaning plastic parts, as they can cause damage. Instead, a clean cloth should be used to remove dirt, dust, oil, and grease. Users are warned against allowing brake fluids, gasoline, petroleum-based products, penetrating oils, or similar chemicals to contact plastic parts, as these can weaken or destroy the plastic.
Abuse Prevention: Users are advised not to abuse power tools, as this can damage both the tool and the workpiece. Any attempts to modify the tool or create accessories are strongly discouraged, as such alterations constitute misuse and can lead to hazardous conditions, serious injury, and will void the warranty.
Lubrication: The tool's bearings are pre-lubricated with a sufficient amount of high-grade lubricant for the unit's normal lifespan. Therefore, no further lubrication is required under normal conditions.

By following these detailed instructions for function, usage, and maintenance, users can ensure the safe, efficient, and long-lasting performance of their Masterforce 5/8" Drill/Mixer.

MasterForce 241-0725 - Page 22

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