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Tooth Geometry and Feed Speeds in Band Sawing
Overview
In the future we must be prepared for increased costs for raw material as
well as for labor and equipment in sawmills. One way of maintaining
profitability is to increase production by using high feed speeds. Another way
is to improve lumber recovery. In practice each individual sawmill tries to find
the correct balance with regard to conditions in the country of production and
to the market for the finished products. However, the problem is very often that
increasing production by means of high feed speeds results in inferior lumber
quality and low recovery figures.
Several conditions in the sawmill will affect this situation and here the
influence of the cutting tool itself, the bandsaw blade, will be considered.
Sawing Accuracy
: Maintaining dimensionally accurate lumber requires a stable bandsaw
blade
Tooth Function
: A short description of the how a bandsaw tooth cuts wood
Tooth Geometry
: Tooth geometry gives the gullet area
Hook Angle
: The type of wood and the intended feed speed should determine the Hook Angle
Clearance Angle
: Clearance Angle prevents the back of the tooth tip from rubbing the wood in the cut
Pitch vs. Depth of Gullet
: Some points to consider on the relationship of pitch and gullet depth at high feed
speeds and varying lumber hardness
Gullet Bottom
: A few points on reducing blade breakage
Gullet Capacity
: Optimizing gullet performance
Feed Speed
: Determining feed speeds for different blade configurations
Kerf : Determining clearances to reduce friction
Conclusion
: Some final considerations
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