Grain

Grain is the direction and pattern of a wood's fibers, set by how the tree grew and how the board was later sawn out of the log. It's one of the first things every woodworker learns to respect, because it's quietly running the show on nearly everything else: how the board looks, how it moves with the seasons, and which direction your plane or router bit needs to travel to avoid an argument.

Grain Direction and Tearout

Think of wood fibers as a stack of overlapping shingles. Cut "with the grain" — the direction the fibers rise toward the surface — and they shear off cleanly. Cut "against the grain" and the tool catches the fiber ends and rips chunks out instead of slicing them, a problem with its own name (tearout) because it happens often enough to deserve one. It's the single most common way a hand-planing or routing session goes from satisfying to swearing.

Flatsawn, Quartersawn, and Riftsawn

How a board is cut from the log determines its grain orientation relative to its faces:

• Flatsawn (tangential-cut): the growth rings run roughly parallel to the board's wide face. This produces the classic "cathedral" grain pattern and is the most common, most economical cut.
• Quartersawn (radial-cut): the growth rings run roughly perpendicular to the wide face. This produces straighter grain lines and, in some species (like white oak), prominent ray fleck figure. Quartersawn boards are generally more dimensionally stable — see the Wood Movement Estimator for how much less a quartersawn (radial) board moves compared to a flatsawn (tangential) one of the same species and width.
• Riftsawn: an intermediate cut, angled between flatsawn and quartersawn, often used for its very straight, consistent grain lines with minimal ray fleck.

Figure

"Figure" is what grain is called once it stops behaving — curly (or "fiddleback") maple, birdseye maple, and burl are all figure caused by irregular fiber growth. It's the reason those boards cost more and look better in a photo, and also the reason they'll punish a dull tool or a heavy pass. Sharper edges, lighter cuts, and sometimes giving up on planing entirely in favor of scraping or sanding are the price of admission.