Tools for Working with Plywood Boards

Introduction to Plywood Boards

Plywood boards are composite materials made of thin sheets or veneers of wood bonded with special adhesives under pressure and heat to improve their dimensional stability. The veneers are usually arranged with perpendicular grains to balance stresses, and the number of layers is usually odd to achieve symmetry and stability. The layered construction gives these boards high rigidity, strength, lightness and ease of machining, characteristics that make them especially attractive for structural applications, furniture manufacturing, cladding and other industrial applications.

Technical Properties and Composition

• Layers or wood veneers: Thin sheets of wood (less than 7 mm thick) that are joined to form the board. The visual quality of faces and core varies according to the grade of the board.
• Adhesives used:
  • Urea-formaldehyde (UF) for interiors
  • Phenol-formaldehyde (PF) for exteriors and marine boards
  • Melamine-urea-formaldehyde (MUF) in some cases
• Types of wood used: Okume, Oregon Pine (Douglas fir), Birch, Calabó, among others.
• Thickness: Varies from 3 mm to approximately 30 mm.
• Weight and stability: Less heavy than MDF of the same size, provides dimensional stability against humidity and temperature.

Types of Plywood Boards According to Layers and Uses

• 3 layers: Light and economical, recommended for decorative veneers.
• 5-7 layers: Commonly used for furniture manufacturing, good balance between strength and weight.
• 9 layers: Ultra-resistant for applications requiring high rigidity, such as shelving, although heavier.
• Flexible plywood: All its veneers oriented in the same direction to allow curvatures.

Recommended Tools for Working with Plywood Boards

Power Tools for Cutting and Machining

• Power Saws:

  • Jigsaw: Ideal for curved cuts or interior cutouts in plywood boards. It is recommended to use thin blades for curves with small teeth and variable speed to avoid burning the blade or splintering the board. For cuts in very tight curves, it is advisable to make previous straight cuts to facilitate the path.
  • Circular saw: Used for straight cuts or to make parallel grooves on the back to facilitate curvatures in the board (grooving technique for bending). The depth must leave the visible surface intact to achieve bending without breaking.
  • Miter saws and telescopic miter saws: To make precise and angular cuts in boards.
  • Saber saw: Use for versatile cuts, including in hard-to-reach places.
  • Table saw: Used for straight cuts in series and for a precise finish.

• Routers and electric planers: For detailed machining, edges, grooves and finishes. Routers allow you to make moldings and curved profiles on the board.

• Wood lathe: Power tool that facilitates turning wood parts such as legs, handles and conical or cylindrical shapes; particularly useful for hardwood without large knots.

• Electric screwdrivers and impact drills: Essential for drilling and screwing quickly and accurately. The drill without hammer with helical drill bits for wood is also used to drill pilot holes and to insert saw blades when making interior cuts with a jigsaw.

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• Sanders (belt, delta, eccentric): For surface finishes, smoothing edges and preparing the board for paint or varnish.

Hand Tools

• Wood saws: Useful for straight cuts, especially if power tools are not available. Require technique to reduce splintering.
• Manual carpenter's planes: To smooth and shape edges and surfaces.
• Chisels and files: For detail work, fitting notches and cleaning cuts.
• Hammers and rubber mallets: For assemblies and adjustments without damaging the surface.
• Files and rasps: For details on edges and fine adjustments.
• Manual screwdrivers: Complement the use of power tools for precise work or for hard-to-reach areas.
• Measuring tools (meter, bubble level, squares): For correct measurement and marking before cutting or assembly.

Drill Bits and Accessories for Drilling

• Drill bits for wood: From normal helical drill bits to Forstner drill bits for clean and deep holes in plywood boards.
• Special drill bits for pilot holes: They are used to pre-drill and allow the introduction of jigsaw blades for interior cuts, avoiding splintering.
• Drill chucks and screwdriver bits: Improve precision in drilling and screwing.

Tools for Bending Plywood Boards

• Grooving technique with circular saw to bend boards:

  • Make parallel grooves on the back of the board, with a width and depth calculated to allow bending.
  • An intact layer must be preserved on the visible face.
  • Fill the grooves with wood glue and let dry to fix the curved shape.

• Jigsaw with blades for curves of reduced radius: For interior cuts and narrow curved shapes.

• Wood lathe: To manufacture round or turned pieces that complement plywood work.

Special Tools for Finishing and Edge Protection

• Edge banders (edge applying machines): Equipment that applies adhesive, places edges and trims in a single process, improving the precision and visual and functional finish of the edges of the plywood board, which are very prone to damage.

• Sanding and filling:

  • To paint plywood, a sanding process with 240 grit sandpaper is necessary.
  • Repair imperfections or knots with wood putty.
  • Apply water-based primer to seal pores before painting.

• Application of waterproof sealants on edges, especially for boards used in humid environments to avoid delamination and water damage.

Techniques and Recommendations for Cutting Plywood Without Splintering

• Use steel saw blades with fine tungsten carbide tipped (TCT) teeth for clean cuts.
• Use masking tape stuck to the edge to be cut to minimize splintering.
• Advance at low speed in the cut to avoid wear and tear.
• Avoid letting the cut piece hang and fall freely to avoid breakage.
• When the edge cracks, apply wood glue and sand later.

Security and Protection

• Use personal protective equipment (PPE) such as work gloves, eye, hearing and respiratory protection.
• Plywood dust, especially if it contains formaldehyde in the adhesives, can be toxic and carcinogenic, so avoid inhaling fine dust and work in ventilated areas.
• Keep fingers and hands away from active cutting or machining blades.

Summary of tools for working with plywood boards

Additional Considerations for Working with Plywood Boards

• Delamination and quality: Check the quality of the board before working, avoiding boards with obvious signs of delamination, excess formaldehyde or very light (indication of low-density fillers).
• Fragile edges: Applying protection avoids damage during handling and transport.
• Suitability to the environment: For humid environments, choose marine or phenolic boards and treat edges and layers with waterproof sealants.
• Decorative finishes: The plywood can be left natural, painted or varnished according to the application, always following appropriate sanding, filling and priming processes.
• Costs and selection: The price depends on the type of wood, adhesive quality and manufacturing processes. It is common for birch boards to be between 30% and 50% more expensive than other types such as calabó; formaldehyde-free adhesives (MDI) also increase the cost.

This compilation details the tools and techniques for working with plywood boards, covering cutting, machining, bending, finishing and protection. Using the appropriate tools and following recommended techniques results in quality, efficient and safe work.

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