FOREST PRODUCTS LABORATORY I FOREST SERVICE
'. U. S. DEPARrMI-.NT OF A(ICI ITURF
S SMALL SAWMILL IMPROVFMFNT
.... 'LRA TICL POINTERS TO FIELD A(.FN'qIES .'- A -.
S1 .,r'-Y WHST TO .. PFw.-.-BL_ ::I-'.L
The .n.u..cer of teams required to complete the chance canr serve as a
rough control for figuring out w,-en to move portable .iiLls in ioig cna..ces
offering more t-ian one set-up. This applies to ":ot log" operations depee.t
on l..iiy renewal rather tha., a reserve of logs at tne mill. Fewer ;euas r.
needed w:.er-. lo-ging .:.r the mill but zones are reached where either more
ti.,..s or new set-ups are essential. It is a case of balancin- tie cost of
moving agaii.st t..e extra team cost and ;..ahi.- allowances for tne influ:.ce of
the moves on luimber hauli,. costs.
The cost of moving within tne chance m:ay be as low as $12 for light
tractor mills to $300 for tne more statiLi.ary mills. Tne opcur.tor esti.aztcs
the cost for his conditions. If tn.e proposed move increases t:e 1 ...'i-r aul
costs he adds the estimated increase; if it c.,a.e;.s tnem he subtracts from
the mill moving cost and divides the result by t-le cost per dao per team.
is gives the number of day:s he c:j-: afford to use an extra team to clean -p
.ino chance from tae first set-up or, if several set-ups L.re possible, -ives
tho extra team-days justified in extending tohe lo _in z" e before ovig.
This inmethod is reasonably practical in a flat, accessible area where -.ilis
can be set up almost a-'.nre on the chance and lumber b'o *iamled o-At.
Some changes are needed for a rough region, -ill sites are defi-
nitely limited and logs will not be 1ro-ht up hill. The initial set-up is
along the lower part ol the chance. After hauling from t-.e snort hau3l area
additional teams may be required to haul fr.:n back areas nn.ad up to the next
site. The next set-up gives another series of team requ','ments. To .eter-
mine the advisability of moving, theo operator figures ti difference in the
estimated number of teaming days* required to haul tnose c_- to the old set-
up which -re tribut-.r.- to the new set-up and tea,.ing dnjs to aul tne sou.e to
the new, multiplies by the cost per team per day, and suotracts the cos- of
movinG. Thu- influence of the prospective move on tne lumber rulingg co.ts is
handled as in calculating moves in a flat region; the estimated increase added
or decrease subtracted from the cost of movir:. the mill. A inus ar-swoer indi-
cates no move is advisable, c.i a plus answer gives the esti_ rl-d gain result-
ing from the move.
For instance, ln.uing is at a point where logs are tribuar., to
either the present site or a :e-.7 one. 'The operator estimates ;hat four teams
will take twenty days or ei.-.ty teaming days to haul to the present site all
logs tributary to the new, and two teams twenty days or forty tta..i'.- days
.aJ.lirg them to the new, or a difference of forty teaming d'-.js. A to'.. costs
$7 per day. He can move the mill for $60 and the increase in cost of hauli.-
out lumber will be $1,0. He stands to gain 40 x $7 or $22-0 .1 to lose $.v
or a net gain of $120 through, moving.
*Equjivalent to the number of lays require for one team to lo- the cianco.
Contributed _.. C. J. 7'lford,
Forest Prolucts :.aoratorj,
R38'-3 J.. 15, 1131.
t Maintained at Madison, Wisconsin in cooperation with the University of Wisconsin
*See outline in Small Sawmill nImprovement Working Plan, March 1930, for explanation no :id,.. .i.g system proposed
UNIVERSITY OF FLORIDA
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