Great Falls tribune. [volume] (Great Falls, Mont.) 1921-current, 1922-06-18
NASH MOTORS USES
GREY IRON HAVING
CHROME AND NICKEL
FOUNDRY, Forge Shop and Heat
Treating Departments
Insure Quality.

II is frequently asked by automobile
owners why one make of car pos
sesses endurance to a point where its
life is far longer perhaps tnan other
cars of similar wheelbase and type.
The answer best known to those most
familiar with manufacturing practices.
lies very largely in the matter of quail
ity of materials that go into an auto
mobile.
Because il manufactures so much of
it's car the Nash Motors company IS
in a position to govern absolutely the
quality: with an immense foundry,
forge shop. heat-treating department,
it is dependent upon no outside faclli-
ties for the quality of metals used in
the important parts of the ear. While.
for instance. it is the practice of some
motor manufacturers to use grey iron
in cylinder blocks. Nash Motors en-
ploys al iron that contains chrome and
nickel.
The grain structure in this Nash
iron is very close and much less por-
Gus than in ordinary grey iron. Por-
Gus iron lends itself readily to dis
~tortion. whereas this is eliminated in
Nash cylinder irons. In the manufac-
ture Of this iron, control of a great
number of conditions is exercised to
bring about perfect castings. AT the
very outset precautionary measures
are taken with the raw material de-
livered at the plant.
Before any of this iron is passed on
to the foundry, tests are made of
samples in the Nash laboratories. 1t
is made certain that the chemical com
poncnts of fine iron are correct. The
material is then sent to the foundry.
where the metal is melted in the Gu
pola and in hot liquid form poured
into moulds.
At this point test pieces are also
poured and sent back to the labora-
tory for chemical and physical exam
nation. In the laboratory each mix
ture Of metal is given what is known
as a Brinell test and it must measure
up to the high standard of that test
before il receives the endorsement of
the company's metallurgists. This is
a check on quality that is as exact as
science can make 1t, and 1t means to
the subsequent car owner assurance
Of quality and durability. BY the Brin-
nell test is determined the degree of
hardness attained in the mixture. The
metal under scrutiny is placed in a
Brncll machine where a perfectly uni
form ball of exceptional hardness is
forced into the metal by a pressing
process. The depth and diameter of
the Impression is registered. thus max
ing it possible To determine the exact
hardness of the material turned out
in any mixture
In some plants a test is made al in
frequent intervals. but with Nash Mo
tors il is made every day. and regu-
lates the work in the foundry for the
following day. And to make sure that
nothing can possibly go aniss in so
Important q matter. the testing instru-
ucuts themselves are checked rigidly
and frequently.
> The degree of hardness in metal
regulates the wear on sylinder blocks.
4 favorable relationship in the rela-
We hardness of the cylinder block.
piston. piston rings. and cylinders is
brought about through the skillful mix
ture Of metals and positive tests. This
means longer life to the motor. Lab
"ratory tests also determine the
strength of cast iron and determine
It's uniformity.
Nash Motors. because of its facili-
ties for manufacture. is making cylin-
der iron of considerably higher Brinell
hardness than can be secured in an
ord nary grey iron casting. All of
which is an answer in part at least.
{" the question of the car owner:
Why do some makes Of ears possess
10 ger life than others?