Tennessee Valley Woodworkers
Vol. 17/ Issue 4 April 2002 Editor: Tom Gillard Jr.
The next meeting of the TN Valley Woodworkers
Will be held, April 16th at 7:00 p.m. in the
Duck River Electric Building, Dechard, TN
All interested woodworkers are invited!
The following people have agreed to serve as contacts for their particular skills. If you have questions, suggestions
for activities, or other comments relating to these skills, please call these folks. Their interest is to help the
club better serve their area of expertise. Your participation with them will help them achieve that goal.
Berry 454-3815 Design
Tom Church 967-4460 Turning Harry May 962-0215 Carving
Bob Reese 728-7974 Sharpening Ross Roepke 455-9140 Joinery
Maurice Ryan 962-1555 Health and Safety
Spring seminar: April 20th @ Foothills
Picnic: June 22nd @ Falls Mill
Coffee County Fair : 3rd week in September
Fall seminar :October time frame
Christmas party: December 6
** It was also suggested that we should have another “turning B” and possibly another carving workshop.
Loyd will be presenting the program next month on "Wood
movement as it Effects Joinery". (<---click
there)This will fit in with our joinery theme this year very well.
Loyd has done a lot of work in this area and as always I am sure that it
will be well presented.
The subject of name tags came up at the last meeting. Our name tags
were made by K&S TROPHIES , 510 Country Club Drive , Tullahoma.
They were about $5.00 including tax the last time we checked. When in Tullahoma
you can go by and have one made. The tags are 1" x 3" with white letters
on a blue background. Just tell the folks that you want a Tennessee Valley
Woodworkers name tag. If you are never in Tullahoma, Henry Davis will be
happy to take care of it for you, see him at the February meeting or give
him a call at 393 - 3191.
To show our appreciation to our loyal and faithful members your Executive
Committee has again this year decided to give a prize to one lucky member.
To be eligible to win the lathe just sign the drawing register at each regular club meeting that you attend between now and December. That means that if you attended the January meeting and attend every meeting from now through November your name will be in the drawing 11 times.
So, things can become confusing when we start talking about the distance
between the angles. On a stave that distance is the width, but on a segment,
it's the length. For this article, we'll refer always to length. Substitute
width" if you're cutting staves.
Also for simplicity, we'll call the angled cuts miters, even though we know they may be either miters or bevels. Note, too, that this article only covers straight-sided cylinders or flat rings. Tapered cylinders or rings with sloped sides call for compound cuts.
Corner and miter angles for various numbers of sides
What's your angle?
A full circle contains 360°. So, to make a closed construction out of straight pieces, the corner angles must add up to 360°. In the simple figure with six equal-length sides shown in the Corner and Miter Angle illustration below, the six 60° corners add up to 360°. But, as shown, 60° is not the angle you need to cut on the ends of each piece. Because two sides come together to make the angle, each side must be miter-cut to exactly half the total corner angle, or 30°.
Here's the rule for finding the angle:
To determine the corner angle for a figure with any number of equal-length sides, divide 360° by the number of sides. To find the miter angle, divide the corner angle by two.
How big will it be?
To figure out the measurement across the assembled construction, shown as D1 in the Assembled Size illustration, multiply the side length (L) times the inside-diameter factor for the appropriate number of sides from the chart below. This dimension, which is the diameter of the largest circle that can be drawn inside the outline of the glue-up, also represents the diameter of the largest round piece that could be sawn or turned from the assembled ring. You can calculate the width across the points, shown as D2, by multiplying the side length times the outside-diameter factor.
FACTOR TO FIND DIAMETER
And if you need to know the diameter of the opening in a ring, shown
as D3, just multiply the length of the short edge of the segment (IL) by
the appropriate inside-diameter factor. You can work backwards, too,
to find the stave length required to produce a given diameter. In this
case, divide the desired diameter by the factor from the chart. To find,
for instance, the side length for a hexagon that measures 24" across (D1),
divide 24" by the inside-diameter factor (1.73205). Doing this gives us
13.85641", or 13-55/64".
The Fair Maidenhair-tree
Ginkgo biloba is known as a "living fossil tree". This tree's genetic line spans the Mesozoic era back to the Triassic period. Closely related species are thought to have existed for over 200 million years.
Also known as maidenhair-tree, the leaf shape and other vegetative organs are identical to fossils found in the United States, Europe and Greenland. Today's contemporary ginkgo is cultivated and does not exist anywhere in the wild state. Scientists think that native ginkgo was destroyed by glaciers that ultimately covered the whole Northern Hemisphere.
Ancient Chinese records are surprisingly complete and describe the tree as ya-chio-tu, meaning a tree with leaves like a duck's foot. Asian people systematically planted the tree and many living ginkgoes are known to be more than 5 centuries old. Buddhists not only kept written records but revered the tree and preserved it in temple gardens. Western collectors eventually imported ginkgoes to Europe where it was very popular in large cities like London and Paris.
G. biloba was first brought into the United States by William Hamilton for his garden in Philadelphia in 1784. It was a favorite tree of Architect Frank Lloyd Wright and made its way into city landscapes across North America. The tree had an ability to survive pests, drought, storms, ice, city soils, and was widely planted. But it did have a problem...
The smell's description ranges from "rancid butter" to "vomit". This foul smell has limited ginkgo's popularity while also causing city governments to actually remove the tree and ban the female from being planted. Male ginkgoes do not produce a fruit and are selected as the main cultivars used to transplant in urban communities.
The slippery pulp can also be a liability. Because of potential city sidewalks slimed with the pulp of the fruit, urban landscapers recommend only the male tree. Some of the best varieties found to plant are 'Autumn Gold', 'Princeton Sentry' and 'Fairmont'.
Thanks for the Memories
Maidenhair-tree's leaf extract is a billion dollar business. According to one recent report, "In Germany alone, ginkgo biloba prescriptions (it is prescribed by doctors in Germany) retailed at $280 million in U.S. dollars". A German manufacturer, Schwabe, sold almost $2 billion U.S. dollars worth of Ginkgo biloba extract worldwide in 1993.
Gingko biloba is most effective as a concentrated extract, found in either liquid or tablet form. It has beneficial effects on the circulatory system, particularly among the elderly. Studies have shown it can help in treatment of their short-term memory loss, headache, tinnitus (ringing in the ears) and depression by improving blood flow in the arteries and capillaries (ask you doctor before trying any new remedies)
* There are no native ginkgoes living in the wild.
All wild trees were wiped out over a million years ago but human intervention
has saved the modern tree.
* Several ginkgoes were the only living survivors of an atomic bomb blast dropped on Hiroshima by the United States.
* About 50 pounds of dried ginkgo leaves yield a pound of the medicinal product.
Sacking a mess before it becomes one
TIP: Tape an open paper bag to
the wall a few inches below
where you plan to drill. Once that
bit starts chewing and spitting out
nasty particles, they will fall right
into the sack. When finished
drilling, simply pull loose the
masking tape, and toss away a mess that never happened.
—Earl Hagen, Livonia, Mich.
WEB SITES of INTEREST
Precision Blade and Tool
Scott Phillips Video Help sessions
Arrowmont School of Arts and Craft
WOOD ONLINE newsletter
Appalachain Center for the Arts
Forest Products Lab. 1999 Wood Handbook
TN Association Woodturners
WOOD Online TVWW page
The Oldham Company
The Woodworker's Choice
Russell Brown's Web Page
10 % OFF Fine Woodworking
Books from Taunton Press
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