The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1915-10-29
SECOND DAYS SESSION


SECOND DAYS SESSION
At the Sugar Mill Engineers conven.
tion yesterday morning the first report
considered was that Of the committee
oil milling. H..
Renton Hind said in opening the de-
bate that the, tendency in growing
seems to be to reduce the pitch. and
depth Of the grooves on the feed rollers
and make those on the discharge rolls
deeper and narrower. William Wyllie
Of onomea said he is now making the
grooves in the bagasse roll one-eigth
inch wide and one and one-guarter
inches deep. Using two sets of scrap.
CRY so as to clear the grooves he gets
four per cent less water in the bagasse.
The Last Three Per Cent T.
In answer to a. query as to whether
reduction of moisture content was
Synonymous with greater extraction, R.
s. Norris said he did not follow the
argument made by J. P. Foster last
week at the chemist s meeting, but be,
litved that a final reduction of water
content resulted in actual increase Of
sugar recovered. This increase appar-
eEtly totals two -tenths to three-tenths
percent where the water content is re-
duced three per cent when the total ex-
traction runs around 81 or 50. He did
not believe the losses in moisture due
to the use of double scrapers. Renton
Hind thought the value Of double
scrapeIs to be that they eliminate
trouble. The variety of cane has a lot
TO do with it. Mr.. Wyllie said the
greatest effect comes from using double
scrapers on the last mill. The depth
of groove is the controlling factor, he
maintained. II single scrapers viii
stay in and do the work that is all
that Is necessary.
Grooves and Scrapers
J. Meinecke said that at PuuneDe
the scrapers are babbited into the toe
of the returner bar. The grooves are
two inches apart and one inch deep.
Joseph Wyllie of Pepeekeo thought
that whether the roller is soft or hard
has something to do with the need for
double serapers. As a matter of fact,
he said, there is no use. having the
Messchaert groove if the grooves are
not kept clean. If they are kept clean
there is no disturbance in the flow Of
the juice and no flooding back. Thomas
Murray of Paauhau, said the scrapers
in the first roll last a long time. In
to be changed every four or five days.
Does It Pay7
Chairman Hind then directed atten
ton to George DuncRn's question,
"dOes it payi" He said that his own
mind is made up that it does pay even
though growing the rolls shortcus
johnson took the contrary view. 81
20 bo
whether it is profitable to try for
higher extractions now that we have
reached 81 per cent. Theoretically it
can be done, but I doubt whether,
Practically, we can, get more sugar in
the bags unless Qualification can be
improved"
Passing on to the Hind Rento on
groove and east steel rollers, Louis
Renton said that mill set which has
been in use all of one season shows very
little wear. Practically the only evil
dence of wear was slight rounding
off at the top Of the grooves. At the
close of the season the bottom of the
grooves were still black. No scrapers
we're used that being the advantage
claimed for the Hind-RentOn invention
Gun Metal. Return Bars.
In answer to Horace johnson y ques.
tion about the substitution OF gun.
H,etal for steel bars Renton Hind said
the reason for using softer bar is,
that steel cuts steel The gun metal
har works well if the hardened rough
surface is left. If the bar is planed
smooth it wears out too quickly. +.
Kopke said that was the fault of the.
MeKubbin bars. They wero too soft.
The bars ought to be hard rather than
ttngh, he said.
The Paauhau double pinions were
discussed by E, Kopke, T. Murray and
w. O. Hall. Mr.. Kopks went into the
theory of so adjusting roller that
there should be no torsion but there is
no way of testing it, out. "Wear is
the only index of the pressure on a
piDion tooth, " he said. The chief val
nc of the double pinion is to take car
of the shock when a shaft breaks
With this Mr.. Hall agreed, saying that
tho double pinion might save a broken
housing, ~
straight-Away Carriers
The Ramsay intermediate Carrier
was declared to. be behaving extremely
well but needs to be raised about four
riches, r. S. Norris spoke of the wear
ing of the toe of the Ramsay scrErrr.
W. G. Hall said that defect has been
recognized and the new model meets
the criticism. He said also that JOS
eph Wyllie has changed the drive to
the discharge end thereby greatly i'm
proving ii.
The warning given by shafts before
breaking was debated. Sometimes the
journals get hot and again they don't.
Discussion of the life of a leather in
ky draulic ram cylinders brought out