A log scaler inspects cut timber to determine how much good, usable lumber can be extracted from it. The log scaler records species identification, dimensions, and defects. The log scaler factors any defects from the log and eliminates a percentage of the wood to waste in the net scale figure or usable wood calculations when calculating a gross and net scale. A non-bias scaler will occasionally rescale a log that has been scaled in order to maintain the scaling certification, and the factors must fall within a predetermined percentage of each other.
A timber buyer uses specific methods to determine which trees from a standing timber growth he wants to purchase. After the trees are cut, the scaler inspects and marks them for species, estimated wood in each log, and any defects. This is the standard method for determining the price of cut timber. From the time the log is harvested until it is sold or cut into dimensional lumber at a sawmill, the log scaler keeps a detailed record of the lumber.
Many internal defects in a log can be detected by external markings on the log, so the scaler must be vigilant and well-trained in order to spot signs of a problem with any given log. While many logging companies employ a scaler, the price of timber cut is frequently set by an independent scaler. This eliminates the possibility of any wood miscalculations or incorrect pricing of logs. To verify the price charged for the lumber, a lumber buyer typically compares the findings of his company’s log scaler to those of an independent scaler.
Scaling lumber is done in three ways: ramp scaling, where logs are scaled while being loaded onto trucks; roll-out scaling, where each log is rolled off the truck and scaled on the ground; and standing timber scaling. In a roll-out scaling process, a scaler provides the best view of the logs of the three methods. For the trucks, this is also more convenient because they can simply empty the logs and drive away. By allowing the log scaler access to more of the log’s surface, this roll-out method also makes it easier for the log scaler to spot signs of internal problems.