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H1 4 Favorites This Wood Species series of entries comes to us from guest writer Rob Wilkey, an Atlanta-based woodworker and industrial designer whose expertise is in small home goods, furniture, and large installations.
Wood series, we'll start talking about the specific properties of different wood species, and the terminology used to discuss those properties. Those of you who were paying attention during the previous MM: W entries will recognize some of the terms, but a little review never hurts. Overdifferent species of trees have been identified worldwide.
Many are endangered, many are inaccessible, and many more aren't suitable for use as lumber. In fact, only a very small portion of these species is harvested and dried for use, but that 'small portion' still comprises over species.
Woods Introduction part of master thesis see in everyday American life—pine, oak, and maple—make up a small and comparatively uninteresting group of species. Around the globe, however, woods vary widely in appearance and physical properties.
Colors can range from pale yellows and grays to vibrant hues of purple, red, and green, and from rich browns to pure, solid black. For example, the South American species Lignum Vitae is so water-resistant and dense that it is commonly used in bearings for large naval craft and hydroelectric dams.
In order to fully understand these differences, and how they can affect your projects, I will cover some of the basic differentiating properties of wood and the terminology used to describe them. Janka hardness is a good place to start when selecting a wood species.
Janka is a measurement of the pounds of force required to embed a steel ball of a certain diameter into the surface of the wood. This gives a very good indication of how easily the wood will dent and scratch. Woods below lbf on the Janka scale can be dented by pressing on them with your fingernail, and as such shouldn't be used on surfaces that will experience a lot of physical contact.
Conversely, woods above lbf Janka are so hard that they can blunt tools and become very difficult to work with. Janka hardness is also useful in that it often coincides with structural stability.
Woods that have a higher Janka hardness tend to be better load-bearing woods than those lower on the hardness scale. Grain type is another important factor to consider.
This tearout occurred when I was trying to plane down the edge of the board—the blade caught a section of grain that was interlocked with the surrounding wood, tearing out the entire area instead of cutting straight across as I had intended.
Certain factors, such as weighty branches and bulbous deformities called burls, can also affect the natural grain pattern, resulting in an effect called figured wood.
The way that light refracts off of the surface of figured wood creates an almost holographic effect that can take the appearance of rolling waves and swirling pits, as seen in the images below. Porosity affects both the appearance and working properties of the wood. Ring-porous woods have larger pores at the edge of their growth rings, while diffuse-porous woods have the same size of pores throughout.
This can affect the appearance of the wood, especially in pieces that are flatsawn, as shown below.The MAcc program prepares students to meet challenges they face in launching a career in public accounting. The structured educational experience of a graduate program broadens and deepens the student's knowledge and skills.
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