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Lumber Processing and Mill Terminology


Cypress Grades • Doyle Log Scale • Hardwood Lumber Grades • Hardwood Defects and Character • Hardwood Measurements • Log Cross Section • Process Terminology • NHLA 2007  Rules Book (pdf 637kb)

 

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Air Dried

Removing moisture from green wood by exposing to the air usually in a yard without artificial heat. Not a complete drying process for interior woodwork.

Band Sawn

The process of cutting lumber with a band saw blade which leaves tooth markings (kerf) on face at right angle to edge of board.

Circular Sawn

Lumber sawn by a Circular Saw with curved blade tooth markings on the face of a board.

Conditioning (in Kiln Drying)

In Kiln Drying, obtaining the same moisture content in the "shell" or outside surface of the board as there is in the "core" or center of the board.

Cut

A portion of a board or plank obtained by cross-cutting, ripping or by both. Diagonal cuts are not permitted.

Double End Trim (DET)

Double End Trim: Board ends are cut at a right angle - usually to a uniform length

End Match

The process of placing a tongue and groove on the plank ends as well as the sides. End Matching is typically required on strip flooring and large commercial flooring mills that utilize 9" to 40"average lengths.

Equalizing or Conditioning (in kiln drying)

Equalizing is the end process in kiln drying that obtains the same moisture content from board to board in a kiln charge of lumber.

Flitch Sawn

A Log that is sawn straight through the heart with bark on both edges.

Green Lumber

Freshly sawn; unseasoned lumber.

Gross Tally

Hardwood lumber is gross tallied or measured when freshly cut. NOTE: Lumber will shrink from 3% to 11% after kiln drying-depending on the species.

Kerf

The path that any saw makes in the process of cutting. Sawdust removed in the sawing process. A band saw blade is typically has a much thinner kerf than a circular saw blade and will produce greater lumber yields.

Kiln Drying

Artificial method of dry lumber by forcing heated air to circulate around the lumber in an enclosed building. Kiln dried hardwoods are typically dried between 6% and 8% moisture content.

Millwork

Lumber that has been "manufactured" by being process through a planer, straight line rip or other process,  including moulding into stock or custom profiles.

Moisture Content

Percentage of moisture present wood; degree of dryness. The weight of the water contained in the wood, usually expressed in percentage of weight of the oven-dry wood. (Oven-Dray weight refers to 100% dry weight....zero moisture content.) 8% moisture content means that 8% of the total wood weight is water.

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Plain or Flat Sawn

Lumber sawn tangent to the tree's annual rings. The standard in most commercial lumber. Advantages in Plain Sawing: is that is less costly and wasteful, hence more available; easier to kiln dry with wider average widths.

Planed - Finish

Finish Planed lumber is planed smooth on both faces to a pre-determined thickness. Our state-of-the-art double-head helical planer eliminates tearing of the wood fibers common with straight knife planers and the joining bed actually flattens each board to a true dimension allowing for proper storage and further machining.

Planed - HoM

Hit-or-Miss Planing or Skip Dressing of Rough Lumber. Dressing the boards allows for accurate grading after kiln drying and allows the board to lay flat, minimizing distortion. The boards will generally plane smooth but will contain some rough areas where the planer skips. With the exception of cypress and cedar, TinyTIMBERS skip dresses all lumber.

Quartersawn

Lumber cut with rings cut at an angle of 45° to straight up 90° i.e., parallel or almost parallel with medullary ray. Quartersawn is often marketed with Rift sawn as a single product.

Quarter sawing requires a slower milling process, demands a higher premium, yields narrower, but generally more dimensionally stable lumber than with plain sawn lumber.

Resaw

The process of re-sawing a plank into thinner boards - either straight or on an angle or bevel.

Rift Sawn

Lumber in which the annual rings make angles of 30° to 60° with the surface of the board.  Rift sawn is often marketed with quarter sawn as a single product.

Rough Sawn

Rough sawn wood has a rough saw texture and APPROXIMATE, ROUGH DIMENSIONS. Rough sawn lumber may have uneven edges and thickness, stick marks left during the drying process, weathering (grey or charcoal colored), and small metal banding marks where it was bundled together.

Surfaced-4 -Sides (S4S)

Surfaced Smooth 4-Sides. This is a ready-made product, surfaced to a specified width and thickness on all 4-sides. The cost of S4S material is greater because it includes all waste factors and machine finishing costs. S4S stock is typically used as cabinet stock, furniture and trim components.

SLR1E

Straight Line Rip 1-Edge. Our equipment maintains an 8' glue-line quality edge, suitable for glue up and joinery processes.

SLR2E

Straight Line Rip 2-Edges. This service includes ripping 2-edges per board. TinyTIMBERS equipment maintains an 8' glue-line quality edge, suitable for glue up and joinery processes.

Steamed

This term refers to a special process in which the green lumber (usually American Walnut or Cherry, European Beach, etc.) is steamed in vats for the purpose of darkening sapwood to blend more consistently with the heartwood color.

Sustainability

This term refers to sustainability of harvestable timber from our Nation's forests through responsible harvesting, replanting and education.

Tongue and Grooved (T&G)

Tongued and grooved on sides of board so that the tongue edge of one board fits into the grooved edge of the next board. Typically used in flooring & plank paneling products.

Vee  Groove (VG) or (Vee Matched)

Narrow and shallow V or U shaped channels machined on the surface to achieve a decorative effect. Vee groove is most commonly used for wall paneling and ceilings.

Wainscot

Wall paneling in 3'-4' lengths, commonly topped with chair rail.

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