Learn About Wood CharacteristicsLearn About Wood Series, Part 2
Learn About Wood Characteristics
General information about wood varieties and wood characteristic, written by Leon Colwell. Originally published in Wood News Issue 2, Feb - Mar 1978. Learn About Wood, Part 2
Different kinds of woods The 1st issue of Wood News contained some general information on woods. Several books and thousands of articles have been written on the physical and chemical characteristics of wood. However interesting, it is not necessary to acquire a vast knowledge of the subject in order to construct and finish beautiful, useful and durable articles ranging from a simple wall plaque to a sheraton desk. I think it is best to acquire knowledge of the properties of wood as you would build articles in your shop. In this issue of Wood News we will deal with identification of woods and some of the properties of the different woods. Highland Woodworking has numerous samples of various species of wood, including some rare imported varieties.
Wood Species
These brief descriptions in no way adequately describe the colors of the species walnut for instance is described as light in chocolate brown. It may be that the 1st piece of walnut you pick up will contain a purple streak or a streak that is almost black. Natural defects in wood are those abnormalities which are due to growth and environment, and include knots, reaction wood (tension and compression), spiral and diagonal grain and mineral streaks to name a few. Again using walnut as an example the color and the grain pattern around the knot will be varied. The weight and movement of the limbs causes tension and compression to occur, causing a change in the characteristics of the wood around the knot. Furniture manufacturers and wood workers call this crotch walnut. Due to the presence of an excessive amount of lignin in this area it is much more dense and his harder than portions of the wood with no natural defects. Natural defects in a board or piece of wood alter the workability of the piece. It goes without saying that a knot, Burl or crotch is more difficult to plane, sand, saw or carve then portion which contains the normal grain. The chart above shows the density of wood which is expressed in weight per cubic foot. It is generally true that the heavier the wood the more difficult it is to work. Butternut is very popular with wood carvers because it is relatively easy to carve. Note that the weight per cubic foot is 22 lbs which is relatively light. I should also like to point out however, that many wood carvers prefer harder, denser wood. In a future issue we will discuss wood joinery and preparation for final finishing, including planing, sanding, staining and sealing. We hope also to include some articles by experts on various phases of woodworking.
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