Wood grain – Spatial Grid Structure manufacturer – Prefab Building
For other uses, see Wood grain (disambiguation).
Maple burl, not to be confused with bird’s eye maple
In speaking of wood the term grain is used in several ways. Perhaps most important is that in woodworking techniques (e.g. against the grain). In describing the application of a woodworking technique to a given piece of wood, the direction of the technique may be:
with the grain (easy; giving a clean result)
against the grain (heavy going; giving a poor result such as chipping or tear-out)
across the grain (direction of cut is across the grain lines, but the plane of the cut is still aligned with them)
end grain (at right angles to the grain, for example trimming the end of a plank)
Grain alignment must be considered when joining pieces of wood, or designing wooden structures. For example, a stressed span is less likely to fail if tension is applied along the grain, rather than across the grain. Grain direction will also affect the type of warping seen in the finished item.
In describing the alignment of the wood in the tree a distinction may be made. Basic grain descriptions and types include:
straight – grain which runs in a single direction, parallel to the axis of the tree
spiral – grain which spirals around the axis of the tree
interlocked – grain which spirals around the axis of the tree, but reverses its direction regularly, alternating, interlocking
Sketch of Auarter-sawn & Blat-sawn
typically figured red gum table
mountain ash floor, showing some fiddleback figure
In addition, there are a few special grain alignments. Their rarity often promotes the value of both the raw material, and the finished work it becomes a part of. These include:
bird’s eye
quilted
fiddleback
curly
In a wider sense, the term grain may also be applied to the orientation of the cut, the way a given piece of wood has been sawn:
flat-grain: flat-sawn, slab-sawn, or plain sawn,
edge grain: quarter-sawn or rift-sawn or straight-grained, and
end grain: the grain of wood seen when it is cut across the growth rings.
Strictly speaking, grain is not the same as the “figure” of wood.
There is irregular grain in burr wood or burl wood, but this is result of very many knots.
See also
Wood as a medium
Wood finishing
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