RIDGID R2720 - User Manual

This document is an operator's manual for a RIDGID 3-inch x 21-inch Variable Speed Double Insulated Belt Sander, model R2720. It provides comprehensive instructions for safe operation, assembly, maintenance, and troubleshooting, ensuring users can effectively utilize the tool for various sanding tasks.

The belt sander is engineered for dependability, ease of operation, and operator safety, designed to provide years of rugged, trouble-free performance when properly cared for. It is suitable for sanding wood, metals, plastics, and other materials, as well as smoothing rough boards, chamfering, rounding edges, and removing rust, paint, varnishes, and stains.

Usage Features:

The sander incorporates several features to enhance user experience and performance:

Switch Trigger: To turn the sander ON, the switch trigger is depressed. Releasing it turns the sander OFF.
Lock-On Button: This feature allows the user to lock the switch trigger in the ON position, enabling extended periods of operation without continuously holding the trigger. If the lock-on feature is engaged and the sander is accidentally disconnected from power, it should be disengaged immediately. Users are advised not to lock the switch trigger if sudden stops might be necessary.
Variable Speed Control Dial: The sander features a variable speed control dial, ranging from A (slowest) to F (fastest). This allows the operator to adjust the belt speed from 800 to 1,500 feet/min, optimizing it for different materials and desired finishes. A chart is provided in the manual to guide proper speed selections for various applications.
Soft Start Feature: This function ensures the motor gradually ramps up to the selected top speed. If the sander is stopped and reactivated, it will gradually return to the previous speed setting once the switch trigger is pressed again.
Tracking Knob: This knob allows for easy adjustment of the sanding belt's tracking. Proper adjustment ensures the belt runs correctly on the rollers, preventing it from running off the sander or contacting internal parts.
Adjustable Front Handle: The front handle can be adjusted using a supplied hex key, providing comfort and ease of operation in different positions and at various angles.
Proper Hand Placement: For optimal control and safety, the sander is designed for two-handed operation, with a stationary rear handle and an adjustable front handle. Users are instructed to hold the front handle with the left hand and the rear handle with the right hand, keeping hands clear of the sanding belt.
Lighted Plug: The power cord features a lighted plug, which helps users easily identify live tools.
Ergonomic Design: The tool's design prioritizes comfort and ease of operation, accommodating different positions and angles during use.

Sanding Belt Selection and Operation:

Selecting the correct size and type of sanding belt is crucial for achieving a high-quality finish. Aluminum oxide, silicon carbide, and other synthetic abrasives are recommended for power sanding. Generally, coarse grit removes more material, while fine grit produces a better finish. The manual advises starting with a coarse grit for rough surfaces, then progressing to medium and finer grits until the desired uniform finish is achieved.

When operating the sander, workpieces should be clamped or secured to prevent movement. Before placing the sander on the work surface, the switch trigger should be squeezed to allow the motor to reach maximum speed. The sander is then lowered to the work surface with a slight forward motion, guided by the front handle and controlled by the rear handle, moving slowly over the work. Allowing the sander to remain in one place will result in an uneven surface. The sander's weight is designed to provide the proper pressure on the sanding belt; excessive pressure can lead to uneven work, clogged belts, premature belt wear, reduced removal rate, motor damage, and irregular belt tracking. The front roller is not designed for contour sanding, as this can cause tracking irregularities and damage the roller.

Maintenance Features:

The manual outlines several maintenance procedures to ensure the sander's longevity and performance:

General Maintenance: Users are advised to avoid using solvents when cleaning plastic parts, as most plastics are susceptible to damage from commercial solvents. Clean cloths should be used to remove dirt, dust, oil, and grease. Brake fluids, gasoline, petroleum-based products, and penetrating oils should not come into contact with plastic parts, as they can damage or destroy plastic, potentially leading to serious injury.
Dust Collection Bag: The sander includes a dust collection bag that attaches to the exhaust hole, minimizing dust during operation. For efficient collection, the bag should be emptied when half full. The manual provides instructions for installing, removing, and emptying the dust bag. A critical warning is issued against using the dust collection bag when sanding metal, as this creates a fire hazard. Additionally, collected sanding dust from surface coatings like polyurethanes and linseed oil can self-ignite, so frequent emptying of the dust bag and proper storage are emphasized.
Belt Tension Release Lever: This lever facilitates quick and easy changes of sanding belts. To install or remove a belt, the tension release lever is lifted to release tension, and then lowered to secure the new belt. Users must ensure the sanding belt's arrow (if present) points in the direction of rotation (clockwise when viewed from the open side of the sander) to prevent hazardous conditions.
Brush Replacement: The belt sander is equipped with externally accessible brushes. The manual provides instructions for checking and replacing brushes, advising replacement of both brush assemblies if either has less than 1/4 inch of carbon remaining. Brushes should be reassembled securely but not overtightened.
Timing Belt Replacement: Instructions are given for replacing the timing belt, which involves removing the dust bag, sanding belt, and belt cover. The old timing belt is removed, and a new one is installed over the small pulley first, then pressed onto the large pulley while turning it. The belt cover and screw are then reassembled and tightened. A warning states that the sander should never be operated without the belt cover in place.
Lubrication: All bearings in the tool are pre-lubricated with a high-grade lubricant for the life of the unit under normal operating conditions, meaning no further lubrication is required by the user.

Safety Information:

The manual emphasizes reading and understanding all instructions to reduce the risk of electric shock, fire, and serious injury. It covers work area safety, electrical safety, and personal safety, including wearing eye protection, dust masks, and hearing protection. It also advises against operating power tools while tired or under the influence of drugs, alcohol, or medication. Users are warned to keep hands and fingers clear of moving parts, dress properly, and avoid overreaching. Regular inspection of power tool cords and extension cords for damage is also highlighted.

RIDGID R2720 Specifications

General

Type	Random Orbit Sander
Power Source	Corded
Voltage	120V
Dust Collection	Yes
Variable Speed	Yes
Orbit Diameter	3/32 inches
Pad Size	5 inches
Cord Length	8 feet
Weight	3.5 lbs