The device described in the manual is a Delta Bench Random Orbital Sander, Model 31-750. It is a woodworking tool designed for sanding various materials, primarily wood, with a focus on achieving a swirl-free finish.
Function Description
The Delta Bench Random Orbital Sander combines the fast, swirl-free finish of a palm sander with the heavy-duty capabilities of a benchtop unit. Its primary function is to smooth surfaces, remove material, and prepare workpieces for finishing by using abrasive discs that rotate and oscillate simultaneously. This random orbital action helps to minimize visible sanding marks and provides a smoother finish compared to traditional disc sanders. The sander is designed for benchtop use, offering stability and control for a wide range of sanding tasks. It can be used with or without a fence, providing versatility for different workpiece shapes and sanding operations, such as edge sanding and flat sanding.
Important Technical Specifications
- Model: 31-750
- Power Source: 110-120 volt, 60 Hz alternating current.
- Motor Speed: 3600 RPM (Revolutions Per Minute).
- Oscillations: 3600 oscillations per minute, which is directly related to the motor speed, indicating a 1:1 ratio of rotation to oscillation cycles.
- Abrasive Discs: The sander is compatible with two types of 9-inch abrasive discs:
- Hook and Loop backed abrasive discs: These attach directly to the disc plate pad.
- Pressure Sensitive Adhesive (PSA) backed abrasive discs: These require a transition pad to be applied to the disc plate pad first.
- Electrical Circuit Recommendation: A separate electrical circuit, not less than #12 wire, protected with a 20 Amp fuse, is recommended for optimal performance and safety.
- Grounding: The tool is equipped with a 3-prong grounding type plug and requires a properly grounded 3-hole electrical receptacle to protect the operator from electric shock.
- Accessory Stand (Optional): Model 50-780 Steel Stand, which provides a stable base for the sander.
- Accessory Disc Holder (Optional): Model 31-752 Disc Holder, designed to conveniently store extra abrasive discs.
- Dust Chute: A 1-1/2 inch I.D. (Inner Diameter) dust chute is provided for connecting a dust bag or collection system.
Usage Features
- Benchtop Design: The sander is designed to be placed on a solid supporting surface, offering stability during operation. It can also be fastened to a supporting surface to prevent tipping, sliding, or "walking" during use.
- Random Orbital Action: This key feature minimizes score marks and allows for maximum wear from the abrasive sanding discs, contributing to a superior finish.
- Adjustable Table: The table height can be adjusted to be slightly lower than the sanding disc, which is important for proper sanding operations. Adjustment is made using adjustment screws and secured with lock nuts.
- Fence: A fence can be assembled to the table and used as a backstop for edge sanding or as a guide for flat sanding, enhancing control and accuracy.
- On/Off Switch: Located on the sander base, it allows for easy starting and stopping of the machine.
- Switch Locking Mechanism: The switch toggle can be pulled out to lock the switch in the OFF position, preventing unintentional starting and enhancing safety when the sander is not in use.
- Dust Collection: The sander includes a dust chute for attaching a dust bag or connecting to a dust collection system, helping to maintain a clean work area and reduce exposure to wood dust.
- Workpiece Support: It is emphasized that the workpiece should always be supported on the work table, and the sander should be used on a solid supporting surface with ample room for handling.
- Sanding Direction: For optimal results and to prevent kickback, it is recommended to sand with the workpiece on the left side of the disc, as the sander operates in a clockwise direction.
- Accessory Integration: The sander is designed to integrate with optional accessories like the 50-780 Steel Stand for a dedicated workstation and the 31-752 Disc Holder for convenient abrasive disc storage.
Maintenance Features
- Abrasive Disc Changing: Discs are easily changed by pulling them from the disc plate pad or transition pad. The manual provides clear instructions for both hook and loop and PSA abrasive discs.
- Cleaning: The manual stresses the importance of keeping the work area clean and clearing debris from the table before sanding. Proper dust removal is also highlighted as a maintenance and safety practice.
- Tool Condition: Users are advised to maintain tools in top condition, keeping them sharp and clean for best and safest performance.
- Lubrication and Accessory Changes: Instructions for these tasks are to be followed as part of routine maintenance.
- Pre-Service Disconnection: Before servicing, changing accessories, or making repairs/adjustments, the sander must be disconnected from the power source.
- Damaged Parts Check: Before further use, any damaged guards or parts should be carefully checked and properly repaired or replaced to ensure proper operation and safety. This includes checking for alignment, binding, breakage, and mounting.
- Cord Maintenance: Damaged or worn power cords should be repaired or replaced immediately by a certified electrician.
- Two-Year Limited Warranty: Delta offers a two-year limited warranty covering repair or replacement of defective parts or the machine itself under normal use, provided the product is returned prepaid with proof of purchase. This warranty does not cover normal wear, misuse, abuse, or unauthorized repairs.
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