Metal Construction Development Part 3: Strip Metal Construction - Wing Ribs Page: 4 of 30
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N.A.C.A. Technical Memorandum No. 528
which may arise in production of new and unusual sections. Ex-
perience shows also that a final die can usually be either modi-
flied or completely remade much quicker than can a pair of rolls.
What is at present considered to be an excellent method of
forming may well be found cumbersome at some time in the future,
but changes in a system of working should not be made without
ample reasons, as the adoption of new methods invariably causes
delays in production.
In connection with this matter of forming I would refer to
a remark appearing in N.A.C.A. Technical Memorandum No. 526,
where it was stated in effect that the need for continuous heat
treatment of steel strip was not apparent. The writer omitted
to amplify this statement and say, "in the thicknesses of metal
hitherto used in strip construction of primary members, and gen-
erally in cases where the steel in the heat-treated state has
ductility adequate to the demands of the required sections."
Ordinary box spars, etc., have component parts rarely less
in thickness than 0.012 in.; more often they have a thickness
of 0.015 in., and in these cases two or three pairs of rolls,
in the very worst cases four pairs and a die, are all that are
necessary to form the strip. The section can be produced at the
rate of 20 feet per minute or so, but as metal construction
has developed so has the possible thickness of strip decreased
from "thin 28 G. steel until now, when material 0.005 in. thick
and having 8.40 properties is being used, it is no longer thei
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Pollard, H. J. Metal Construction Development Part 3: Strip Metal Construction - Wing Ribs, report, August 1929; (https://digital.library.unt.edu/ark:/67531/metadc65381/m1/4/: accessed May 7, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.