Understanding the specific vocabulary used in the woodworking trade transforms a simple hobby into a precise craft. From the raw texture of a rough sawn board to the final sheen of a hand-rubbed finish, each term describes a specific state or action. This glossary of wood terms serves as a bridge between the language of architects, cabinetmakers, and DIY enthusiasts, ensuring clear communication for any project.
The Language of the Lumberyard
Before a single tool is pulled from the rack, the terminology begins at the point of purchase. When selecting materials, the vocabulary shifts to describe physical properties and manufacturing processes. These foundational terms dictate how the wood will behave during construction and determine the structural integrity of the final piece.
Board Feet and Dimensions
Lumber is sold by the board foot, a volume measurement rather than a linear one. One board foot equates to a piece of wood 12 inches long, 12 inches wide, and 1 inch thick. Actual dimensions often differ from nominal values; a "2x4" is typically 1.5 inches by 3.5 inches due to the milling process. Understanding this discrepancy is vital for accurate quantity estimation and cost calculation.
Understanding Grain and Figure
The grain direction dictates the strength and workability of a board. Wood fibers run parallel to the length, meaning the material is strongest when cut with the grain. The figure refers to the visible pattern on the surface, including variations like fiddleback, ribbon stripe, or quilting. Selecting lumber with a desirable figure is essential for aesthetic projects, while structural applications prioritize straight grain for load-bearing capacity.
Processing and Preparation
Once the raw material is home, the terminology shifts to the workshop. This phase involves altering the wood's shape, size, or surface texture. The language here describes the techniques used to refine the material into a usable substrate.
Rough Cutting and Resawing
Rough cutting is the initial breakdown of lumber to manageable sizes, usually performed with a circular saw or handsaw. A more specialized term is resawing, which involves slicing a board along its thickness to create two thinner pieces. This technique is popular among those seeking to maximize material from a single plank or to create book-matched veneer patterns.
Jointing and Planing
Before edges can be glued together, they must be jointed to create a perfectly straight edge and a flat face. Jointing refers to the process of making these perpendicular surfaces true. Following this, planing (or thicknessing) reduces the board to a consistent thickness while smoothing the surfaces. The result is squared stock ready for precise joinery.
The Science of Moisture
Wood is a hygroscopic material, meaning it constantly interacts with the moisture in the air. Ignoring the moisture content (MC) of wood is the primary cause of post-construction problems like warping, splitting, and glue failure. The terminology surrounding moisture is critical for long-term success.
Green vs. Dry Wood
Green wood is freshly cut and contains a high percentage of moisture, often exceeding 30%. Using green wood in a project guarantees future shrinkage and distortion. Dry wood, on the other hand, has been seasoned either naturally or artificially to a stable moisture content. For interior furniture, a target MC of 6% to 8% is standard, aligning with the average humidity of the intended environment.
Equilibrium Moisture Content (EMC)
Equilibrium Moisture Content (EMC) is the point at which wood neither gains nor loses moisture because the surrounding air's humidity matches the wood's internal moisture level. Woodworkers must acclimate their materials to the shop environment for several weeks before machining. This ensures the wood reaches EMC, minimizing the risk of movement after the project is complete.
