Hook Angle

The size of the hook angle is a question of the type of wood and the intended feed speed. The generally accepted rule is that softwoods require a greater hook angle than hardwoods. On the other hand the smaller the hook is the slower the cutting capacity of the machine will be. In practice it is impossible to use too many different hook angles in one mill, so a correct balance in the choice is necessary.

The object of the hook angle is for the teeth to "hook" themselves into the timber remove a certain amount of material so that the log is fed into the saw. If the hook angle is too small the log must be forced into the saw blade in order to make the saw cut. This may create a rubbing action that will wear the teeth faster and make them blunt. Side deflections may be another effect.

The figure below shows some general recommendations. The decision must be based on type of wood and feed speed.

Choice of Hook Angle

Hook angle 15 20 25 30
Type of wood Hardwood
(high density)
Hardwood
(medium to low density)
Hardwood
(low density)

Softwood

Softwood
Feed speed <8 m/min. 8-27m/min. 27-46 m/min. >50 m/min.

 





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