The Forest Republican. [volume] (Tionesta, Pa.) 1869-1952, 1872-02-13
do our duty as we understand it, LINCOLN.
SO PER ANNUM.
Management Of Mil. Saws.

far back in the history of mechanical
progress, has never been brought SO
near the condition of exact, science as
might at first glance appear possible.
1t is not complicated process, and
all its methods, appliances and results
are plainly apparent and easily follow
ed by the eve Of the observer, and it is
moreover the subject of such constant
experiment and investigation that one
would naturally expect set Of well
defined established conclusions arrived
at as the fruit of so much inquiry, and
adopted for their future guidance by
all workmen in this branch of indus
try lr4.r.T tYe r.... III u.
Its scarcely too much to say, how
ever, that every operator Of saw-miil
has a set of rules and his own cherish.
ed beliefs in regard to every step and
condition of the process, whether it be
the number, size or shape of the teeth,
the speed of the say, the feed, or the
method of setting and fling. On all
these matters there is formidable ar
ray of authorities, but it is difficult TO
find any two of them who precisely
agree, SO that the researches of the in.
quirer leaves him in more doubtful
state of mind, if possible, than when be
began. 49, y '-
In regard to the speed Of circular
saw, it is hardly possible to establish a
uniform standard, the manner being
greatly Influenced by the kind and
condition of the lumber which is to be
worked. A rule in very common use
among mill men fixes niue thousand
feet as the maximu n distance which
should be Travelled by the tooth of a
saw per minute4- which Is equivalent
to about roo resolutions per minute
for a fifty inchsaw, or little over 100
revolutions per minute for thirty
inch saw This may be regarded as a
safe outsid, limit for ordinary cases,
although still more rapid motion is
often given. 1t should be borne in
mind that to attain this degree of speed
with good practical effect, all parts of
the machinery REQUIRE to be veiy
strongly made and accurately adjust
ed and regulate, and the saw should
be kept in the best possible condition.
The regulation OF the feed is another
matter in which the circumstances have
great weight in determining the meth
I'd to be adopGed. AS general thing,
however, the operator is moro likely
to err by giving too light feed than
in the opposite direction. With j! !!
inch feed, for example, twice as much
lumber will be sawed as with 45inch
feed, and often with much less than a
proportivnate increase either in the
amount of power consumed, or IN the
dulling ofthe saw the inference being,
Of course, that with too light feed a
large proportion of the power goes to
waste, and the saw is -dulled without
performing its due amount Of practi'
cal service. There are cases in which
a very heavy feel as high as three to
five inches--can be successfully en-
ployed, but these are not III the o. din
airy line Of work. The general rule,
however, will be found a useful one,
to give feed fully up to the capacity
Of the saw, as nothing is saved either
in power or in the durability OF the
saw by falling short of that limit.
Another point on which there is a
wide difference of opinion is whether
the teeth of the saw should be set or
upset-that is, whether the point ofthe
teeth should be turned or set outward
in opposite directions, or the toorh
spread or swedged so as to make the
saw cut a sufficiently wide path through
the log to keep it clear of the timber
and prevent any binding or friction on
the sides. Some workmen conten
that the spreading of the points cannot
be done without injury to the steel
but this depends chiefly on the care
and skill with which the operation is
performed. If properly done, we are
inclined 10 believe that the spreading
or upsetting of the tooth will give bet.
ter results than are obtained by setting
in the ordinary manner. We have
observed that in saving lumber with
| the teeth of the saw bent in alternate