Lumber Board
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How long must a log be to yeild 600 board feet of lumber?
equation: .0655l(1-p)(d-s)²
l=length in feet
p=percent loss due to cut of saw
d=diameter
s=inches trimmed off the log to make boards
The diameter of a log is 25 in. A total of 2 in. will be trimmed off the log. The estimated volume loss due to saw cuts is 10%. How long must the log be to yeild 600 board feet of lumber?
Yeah, I need help with that question :/
I'm GUESSING that the equation will be .0655l(1-.1)(25-2)² and you solve for l. help? 0.o
You plugged the number in correctly. Remember, this is an equation, though, and you need 600 board feet, so
600 = .0655l(1-.1)(25-2)²
600=0.0655l(0.9)(23)²
600/(0.0655*0.9*23*23) = l
l = approx 19.24 feet
I hope this helps!
Portable Lumber Mills & Band Sawmill detailed explanation
The desire to gain a deeper understanding of wood eventually leads some woodworkers out of the shop and lumberyard, into the woods, and back to the tree itself. By sawing your own Iumber from logs, you can produce boards that exactly meet a project's specifications and gain valuable insight into wood as a living material. Each step yields a thrill of discovery as you watch patterns of grain and figure emerge from the log.
A number of lumber mills on the market allow you to cut through-and through cut, plain-sawn or quarter sawn boards. These tools include large stationary production mills capable of cutting logs more than 20 feet in length, portable models with tough band saw blades, and still smaller units that use chain saws.
The procedures on Woodworking Plans Website pages show you how to cut logs into lumber with a chain saw that is guided by a jig that attaches to it. Besides the cutting jig and a hearyduty saw, this simple method requires nothing more than a straight board, a hammer and a few nails.
Most chain saws are designed to crosscut trees-that is, buck the logs into shorter lengths after the trees are felled and delimbed. Cutting logs into lumber is a ripping operation in which the sawing is done along the length of the log, Ripping with a chain saw requires at least three times as much power as crosscutting, and the saw must run at full throttle throughout most of the cut. Because much portable lumber milling involves hardwood logs, it is best to use a direct drive chain saw rated at a speed of at least 3000 feet per minute, with a ripping chain installed. To minimize strain on the saw, try to select logs that are relatively free of defects such as twist and taper, with few knots and burls.
Felling trees and cutting logs with a chain saw is dangerous work requiring safe working habits. Pay attention to your task at all times and keep cutting edges sharp, clean and well maintained.
Since prolonged work with chain saws can damage the ears, wear hearing protection, such as earplugs or ear muffs. Proper dress for chain saw work also includes a fuIl-face shield and steel-toed boots; do not wear loose clothing. You can also don special chain saw gloves to protect your hands and a pair of safety chaps made from a tough, synthetic fiber, such as Kevlar'", to protect your legs should the saw accidentally slip or jump back.
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