DEWALT DW788 20-Inch Variable-Speed Scroll Saw User Manual

Introduction

The DEWALT DW788 20-Inch Variable-Speed Scroll Saw is engineered for precision and ease of use in detailed woodworking. Its innovative design minimizes vibration and noise, ensuring highly accurate cuts. Key features such as tool-free blade clamps, an accessible on-off switch, electronic variable speed control, and a flexible dust blower and blade-tensioning lever are conveniently located on the front upper arm for optimal user experience. The unique arm design allows for easy blade threading for inside cuts and maintains blade perpendicularity to the workpiece, enhancing cutting accuracy. The oversized, cast-iron table provides robust material support and can bevel 45 degrees left and right for versatile cutting angles.

Figure 1: DEWALT DW788 20-Inch Variable-Speed Scroll Saw

Safety Information

Always prioritize safety when operating power tools. Read and understand all instructions before use. Failure to follow warnings and instructions may result in electric shock, fire, and/or serious injury.

• Wear appropriate personal protective equipment (PPE), including safety glasses, hearing protection, and a dust mask.
• Ensure the work area is clean, well-lit, and free from clutter.
• Keep children and bystanders away while operating the saw.
• Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
• Always unplug the saw from the power source before making any adjustments, changing blades, or performing maintenance.
• Secure the workpiece firmly to prevent movement during cutting.
• Avoid awkward hand positions. Always maintain proper footing and balance.
• Do not force the tool. Let the saw blade do the work.

Components and Features

The DEWALT DW788 scroll saw is designed with user convenience and precision in mind. Familiarize yourself with its main components:

• Double Parallel-Link Arm Design: Reduces vibration and noise for extremely accurate cuts.
• Tool-Free Blade Clamps: Allows for quick and easy blade changes without the need for additional tools.
• On-Off Switch: Conveniently located on the front upper arm for easy access.
• Electronic Variable Speed Control: Adjust cutting speed from 400 to 1,750 strokes per minute to match different materials and intricate designs.
• Flexible Dust Blower: Directs air to clear sawdust from the cutting line, ensuring clear visibility.
• Blade-Tensioning Lever: Located on the front upper arm for quick and easy blade tension adjustments.
• Oversized, Cast-Iron Table: Provides stable support for large workpieces and can bevel 45 degrees left and right.

Figure 2: DEWALT DW788 Scroll Saw with optional stand, highlighting its robust design.

Setup

1. Unpacking and Placement

Carefully remove the scroll saw from its packaging. Place the saw on a stable, level workbench or an optional dedicated stand. Ensure there is ample space around the saw for safe operation and material handling. The saw weighs approximately 56 lbs (30 kg), so ensure your surface can support it.

2. Blade Installation

1. Ensure the saw is unplugged from the power source.
2. Lift the upper arm to provide access to the blade clamps.
3. Loosen the tool-free blade clamps on both the upper and lower arms.
4. Insert the new blade into the lower clamp, ensuring the teeth are pointing downwards and towards the front of the saw. Tighten the lower clamp.
5. Thread the blade through the workpiece (if making inside cuts) and then into the upper clamp. Tighten the upper clamp.
6. Adjust the blade tension using the blade-tensioning lever until the blade is taut but not overly tight.

3. Table Adjustment

The cast-iron table can be tilted for bevel cuts:

• Loosen the table lock knob located beneath the table.
• Tilt the table to the desired angle (up to 45 degrees left or right) using the angle scale as a guide.
• Tighten the table lock knob securely before operation.

Figure 3: The scroll saw with an attached dust collection hose for a cleaner workspace.

Operating Instructions

1. Powering On/Off

The on-off switch is located on the front upper arm. Press the "ON" button to start the saw and "OFF" to stop it.

2. Adjusting Speed

The electronic variable speed control allows you to adjust the strokes per minute (SPM) from 400 to 1,750. Turn the speed control dial to increase or decrease the cutting speed. Slower speeds are ideal for intricate cuts and harder materials, while faster speeds are suitable for general cutting and softer materials.

3. Cutting Techniques

• Straight Cuts: Guide the workpiece slowly and steadily along the desired line.
• Curved Cuts: Gently pivot the workpiece around the blade to follow curves. The thin blade allows for tight turns.
• Inside Cuts: Drill a pilot hole in the waste area of your workpiece. Unclamp the blade from the upper arm, thread it through the pilot hole, and re-clamp it. Perform the cut, then unclamp and remove the blade.
• Dust Blower: Position the flexible dust blower to direct air onto your cutting line to keep it clear of sawdust.

Figure 4: A user demonstrating precise cutting with the scroll saw.

Maintenance

Regular maintenance ensures the longevity and optimal performance of your DEWALT scroll saw.

• Cleaning: After each use, unplug the saw and use a brush or vacuum to remove sawdust and debris from the table, blade area, and motor vents.
• Blade Care: Replace dull or damaged blades promptly. Store blades properly to prevent damage and corrosion.
• Lubrication: Refer to the detailed user manual (PDF) for specific lubrication points and schedules.
• Inspection: Periodically inspect all moving parts, fasteners, and electrical cords for wear or damage. Tighten any loose fasteners.

Troubleshooting

Specifications

• Motor: 1.3 Amp
• Voltage: 120V AC
• Strokes Per Minute (SPM): 400-1,750 (Variable Speed)
• Blade Length: 20 Inches
• Table Size: 16" x 23-3/4"
• Table Bevel: 45 Degrees Left & Right
• Weight: 56 lbs (approx. 30 kg)
• Dimensions (L x W x H): 29.5" x 19.5" x 12.1"
• Power Source: AC
• Blade Material: Alloy Steel
• Surface Recommendation: Wood
• Safety Certifications: Meets OSHA standards, CSA approved, U.L. Listed

Warranty and Support

The DEWALT DW788 Scroll Saw comes with a comprehensive warranty package to ensure your peace of mind:

• 3-Year Limited Warranty: Covers defects in materials or workmanship.
• 1-Year Free Service Contract: Provides free maintenance of the tool.
• 90-Day Money-Back Guarantee: Allows for a full refund if you are not completely satisfied.

For detailed warranty information, service inquiries, or to download the full user manual, please refer to the official DEWALT website or the provided PDF document:

Download User Manual (PDF)

For additional support or to explore other DEWALT products, visit the official DEWALT Store: DEWALT Store on Amazon