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The cut that does not go through the heart of the tree is the cutting edge.
Theoretically, the wood grain will draw parallel lines by making it parallel to the lines that pass through it while avoiding the heart of the tree.
The condition is that a certain amount of growth is repeated, but in nature everything is not necessarily constant.
As a result, the straight grain may flow a little, and this is called trailing grain.
board
Grain is the periphery of the wood, straight grain is the center,
The board is cut from the middle.
Straight grain
The grain that appears on the surface of wood when it is cut near the center.
Unlike board grain, the wood grain is straight.
It is highly rare because it is cut from the core, resulting in incomplete parts that cannot be made from wood.
Grain
A wood grain pattern with curved lines that is split or sawn parallel to the growth rings.
It is possible to saw wood with larger grains.
