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Gullet Capacity
The actual size of the gullet is given by the pitch. The size
of the gullet controls the maximum cutting height, log size and feed speed. The
gullet must be able to accommodate the produced amount of sawdust.
One way to find the gullet area is to draw a sketch of the
tooth on a graph paper and count the squares. Another way is to use a rule of
thumb which says that the gullet area is roughly the pitch times the depth
divided by 1.75, see the figure on the left.
It is known from experience that you cannot utilize the full
gullet capacity. The gullet will start spilling with drastically deteriorated
accuracy to the size of the lumber before 100% of the gullet area is used. The
utilized gullet capacity should be about 50%-75% of the gullet area. There are a
lot of different opinions on this subject.
Gullet area and gullet capacity
Some results from test sawing in
softwood are illustrated in the figure on the right, where the standard
deviation of sawn lumber is given as a function of the utilized part of the
gullet area.
Choice of gullet capacity
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