log is cool. This will cause the metal to shrink and
practice of lubricating the surface of the knees
on which the log rests when they are taking on a
12-7. Another factor that will affect the operation of
large log because it helps in turning the log.
the saw is an improper angle on the front of the tooth.
Some operators use powdered graphite on the
This will us the saw to run "in" or "out." Remember,
head block slides instead of oil.
. Remove all bearings
on which the carriage slides
the cutting edge of the saw should be straight across.
and wash them out with solvent and repack
12-8. Speed. Usually, the speed of a portable sawmill
them with pressure gun grease once a year.
is the greatest that can be maintained both in and out of
the cut. A usual mistake of operators is to try to operate
13-3. Saw. In handling the saw, always observe the
the saw at too great a speed. A regular uniform speed
both in and out of the cut insures more lumber and more
a. Don't ever saw with a "hot" saw.
accurate lumber. The speed should be governed by the
b. Never saw with dull teeth.
available horsepower, of course, and must be increased as
c. Don't allow chips to rub the saw.
the power to drive the saw is increased.
d. Keep the saw clean of pitch. (NOTE: Pitch
sticks only to a hot saw.)
Carriage. When checking the carriage, proceed
13. Basic Rules In Sawmill Operation
a. Be sure that the carriage is level.
13-1. There are many basic rules that are important in
b. Always check the carriage before you start
sawmill operation. These rules apply to greasing the saw,
handling the saw, and checking the carriage.
sawing by running it up and down the track two or three
time to determine whether the ropes are in order and the
13-2. Greasing. While greasing the sawmill, do as
saw is in the clear.
c. Always check the dogs when you are not sawing,
. Apply heavy oil
to the gears
of the sawdust
especially on the "return" after the last board is cut from
conveyor twice daily b. Use soft, light pressure
the log. Keep the dogs away from the saw.
d. Always keep the saw guides adjusted properly.
c. Use only pressure gun grease in grease gun.
e. Always lock the carriage when you complete the
d. Lubricate the knee slides and gear rack slides
day's work or whenever the machine is not in operation.
and other moving parts frequently with light
f. Always put in the carriage bolt and lockpin and
machine oil. Some sawmill operators make a
set the hand brake when you are going to move the mill.