Sawmills deal with highly variable raw material and end products. The sawmiller is expected to manufacture end products with precision in the least time with the lowest cost. The correct selection of a saw for the primary breakdown job is a critical decision.
The costs for raw materials have increased while the average price sawn products has not increased at the same rate in recent years. The efficient conversion of raw materials to sawn products is now more important. Many sawmills have become conscious of the fact that total production costs do not decrease continuously when feed speed increases. Production does not equate with efficiency. Obviously, most of the money in a sawmill is earned by converting as much of the raw materials as possible into sawn products. The best place to start increasing efficiency is with the primary breakdown machine and saw.
The saw must be set up and operated within certain parameters for efficient and balanced performance. The interrelationships of raw material, end product, machinery and the sawing process are essential. Often these interrelationships are ignored when a saw is chosen. One is often chosen for immediate availability rather than by experience and an understanding of the technology.
Saws must be chosen to meet adequately the objectives in conversion of raw material to end product. Correct bite, feed speeds, tooth speeds, side clearances and power requirements should be considered with the density of the raw materials and average depths of cut.
Bandsaws
The variables of efficiently producing sawn products are influenced by the interplay between the raw material, the saw blade and the machine. The bandsaw at work with the machine is a series of complicated relationships including blade strain, residual stresses from blade tensioning and variations from stresses when the blade runs over the wheel.
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