Even though the user has no influence on the cutting wood, it has to know what the composition of trees and properties of its individual parts.
the figure shows a cross section of the structure of wood and some zones are specially marked. the picture shows the biological composition of the tree.
The quality of wood that we get to the store depends on the breed tree. The error count, above all wrapped tree (slope of), which is especially unpleasant. It can identify more with the tree, and later on ripped tree. this error are determined by laying his right hand on the tree.
Wood is usable if it curls toward the little finger.
If the curl in the direction of inches is not usable. If the fibers are twisted, it is necessary that the wood during the drying turns, but the process can take years.