Sustainable Bio. (Lumber) Flashcards
Lumber is dried to a specific moisture content
Kiln
Softwood lumber production is almost evenly split between what two regions in the U.S.?
South and West
Often defined for trade as a product sawn from a log.
Lumber
Softwood lumber less than 2 inches thick
Board
Softwood material 2-4 inches thick
Dimension
Softwood pieces 5 inches or thicker
Timber
Single most important hardwood species
Red Oak
Used principally as a building construction material
Softwood Lumber
Approximately 3/4 of the softwood soft timber harvested in the U.S. is what two species?
Douglas Fir and Southern Yellow Pine
Measuring the volume of logs
Scaling
Hardwood lumber grades were developed with the assumption that lumber would be cut into smaller usable pieces called
Cuttings
A log rule defines a conversion that relates the _____ of a log to an estimate of lumber yield.
Diameter and Length
Log rule that provides the closest estimate to actual lumber production
International 1/4-in. Rule
The log rule that greatly underestimates the volume of lumber that can be obtained from small logs
Doyle Rule
The main reason for debarking logs prior to sawing so that the bark-free slabs can be chipped and sold for use in making pulp. Bark is usually used for ____
A fuel source
The most widely used type of debarker in saw mills
Ring Debarker
Machine traveling on rails which conveys logs back and forth through the saw
Carriage
Head saws often did not cut the lumber to its final thickness, but instead sawed the log into thick pieces called
Cants
A head rig developed in the 1960s and now used throughout part of America for small softwoods
Chipping Saw
The width of the cut made by the saw
Kerf
Cutting lumber to width
Edging
Cutting lumber to length
Trimming
The portion of a lumber manufacturing plant where cutting the final size and surfacing is done
Planer Mill
Bark or lack of wood on the edge or corner of a piece of lumber
Wane
Reduces logs to the desired length and proper mill utilization
Cutoff Saw
A combination of volume, grade, and size gives you
The value of a piece of lumber
The organization that writes the grades used in U.S. and Canada for hardwood lumber
National Hardwood Lumber Association
Trade association responsible for preparing and administrating the grade rules for softwood lumber
Southern Pine Inspection Bureau
No specific moisture content or ____ is sold as dry or kiln dry.
Hardwood Lumber
A mill producing twice as much lumber as the log scale would have ______.
A 100% overrun
Cuts a cant into multiple boards with a single pass
Gang Saw
Cuts straight boards from a crooked log
Curve Saw
