TECHNICAL GUIDE FACT SHEET

As with all wood, Lyptus® hardwood lumber may have natural variations in grain and color, surface imperfections and slight warping or shrinking that can be corrected or minimized with appropriate processing, milling and finishing techniques. The following are intended as recommendations.

Technical Recommendations

Chopping (Cross Cutting)

Use saws with at least 32 carbide teeth. For best results, use 60-tooth saws with a saw axis rotation of 3,500 RPM to cut the wood without bending the fibers. The cutting angle for medium- and high-density wood should be 0° to 10°.

Tips and troubleshooting:

  • If surfaces show signs of burning after cutting, check for a dull blade, saw misalignment or insufficient feed rate.
  • Feed rate should be slower for parts with reverse grain.
  • For a smoother cut, keep the feed rate constant.
  • Avoid jerking movements when using manual equipment.

Ripping

Use saws with at least 48 hardened metal teeth, a cutting width of no more than .125 inches and saw axis rotation of 3,500 RPM. The cutting angle for medium- and high-density wood should be 15° to 20°.

Tips and troubleshooting:

  • Using a rotation of less than 3,500 RPM may result in bent fibers or burning that can adversely affect subsequent operations such as edge gluing.
  • If cutting edges appear burned, check saw alignment.

Planing

Use high-speed steel, or ideally carbide tools with four or more blades, at 6,000 RPM. Use a 20-25 ft/min feed rate and cutting depth of no more than .04 inches. The cutting angle should be 25° for optimal performance.

Tips and troubleshooting:

  • A sharp tool is essential to ensure planing quality.
  • If fuzzing occurs, sharpen blades.

Gluing

Lyptus hardwood is considered an easy species to glue with no special requirements needed. There are several types of adhesives on the market designed for different uses that meet various environmental requirements.

Important factors for proper gluing:

  • Wood moisture content for gluing should not exceed 12%, with the ideal moisture content ranging from 6% to 8%.
  • Depending on the temperature, a relative humidity of 30% to 40% will help maintain wood moisture content of 6% to 8%.
  • Atmospheric and press temperatures below the minimum cure temperature may cause improper curing, resulting in a weak glue joint.
  • Distance between clamps should be no greater than 8-12 inches.

Finishing

A sanding sealer is recommended prior to finishing.

Sanding

Feed rate of no more than 18-20 ft/min is recommended. Use shallow sanding depths of no more than .01 inches as burning may occur at .02 inches. Replace sand paper frequently.

Tips and troubleshooting:

  • Always sand in the direction of the grain to produce a good surface finish.
  • Do not sand a wood surface that is to be glued.
  • Careful preparation of the surface will result in a better-quality finish and will reduce the absorption of sealants, primers, varnish and paint.

Shaping / Molding

Follow the direction of the wood grain. Use carbide tools running at no less than 6,000 RPM, with a maximum feed rate of 40-50 ft./min. Rotation rates of less than 4,500 RPM result in burning. Cutting angles should be 14° to 18°. Keep machinery well lubricated.

Tips and troubleshooting:

  • For smoother edges, start cutting on the end of the board (the side that is perpendicular to the fibers) and finish on the longitudinal side (the side that parallels the fibers).

Drilling/Boring

Use carbide or high-speed steel drills with a rotation of 600 RPM, at slow feed rates. At faster spindle speeds, burning may occur. The diameter of the holes should not exceed 1/3 of the thickness of the board.

Applying Staples, Nails and Screws

Do not align staples, nails or screws in the same grainline; this could cause splits. Nails should be located no closer than 2.75 inches from the edge of the pieces. They can be hammered in manually or with pneumatic pistols, using a working pressure between 80 and 120 psi. Lyptus® hardwood resists splitting as well as or better than true mahogany.

Link: Lyptus Brochure

© 2012 Weyerhaeuser NR Company. All Rights Reserved. Legal Notices. Facebook   Twitter   Pinterest   houzz interior design ideas