The Washington times., 1927-07-06
HUPNOBILE HAS
SUPER TESTS

Nothing is left to chance in
building cars at the plants of the
Hupp Motor Car Corporation.
: Every part subject to stress and
strain in both the Hupmboile Six
and Eight is checked and tested
before being permitted to enter the
construction Of either car.
This process begins even before
materials reach the Hupp plants.
The company keeps its own inspec-
tors in many of the sources from
which it buys materials. Their
duty Is to see that these materials
are made in strict conformance to
Its standards, which are, in scores
of Instances, the highest in the en-
tire automotive industry. To the
obvious advantages OF maintaining
these inspectors at the sources OF
supply, ID the additional one of
eliminating unnecessary shipping,
further lowering costs.
PROBLEMS OF ENGINEERS
Engineers long ago determined
the individual stress on each part
Of the cars they build. Their next
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the proper factor of safety and,
constantly the various parts to de.
termine that this factor actually
q built into each.
Here Is where the physical test
laboratory does its part in the
Hupp plants. Materials and actual
parts are here tested for such ele-
ments as tensile strength, trans.
verse DETECTION, ability to with
stand torsional strain, ductility and
the various other stresses to which
the parts of an automobile are sub
5ect in actual use.
Characteristic of its policies for
nearly twenty years, Hupmobile
demands that every part OF its cars
be fully competent to Withstand
strains far greater than even
abusive driving will probably ever
heap on it. Rear axle shafts in
both its six and eight cylinder cars.
Tor example. must Withstand tests
up to 100000 pounds per square inch
of elastic limit. AS the severest
road stress on its rear axles in less
than 10000 pounds per square inch,
the company provides safety fac
tor Of eight to one in this vital part.
KnuckIes Are Tested
Steering knucxles are tested up to
115.OQ0 pounds per square inch, a
five to one safety factor. Front axe
I-beams must Withstand 100000
pounds per square inch. more than
q three to one safety margin. Con-
iecting rod cap bolts and cylinder
head studs are tested UP to $4,000
pounds elestic limit-providin a
safety factor OF six or seven to one
for each. Connecting rod tests call
Tor their standing up under 10000
bounds. three times the strain they
must undergo In toughest abuse.
Testing axle shafts for their abil-
ity to withstand torsional strain Is
an interesting operation. Before
the two ends of test shaft are
placed in huge steel jaws that grip
them moer securely than a pressure
of even 10000 pounds per square
inch can overcome. straight white
line is drawn along its length. Then,
one end being held stationary in
the steel jaws, the other is slowly
turned.
Further Examinations
Observers note the pressure re.
uuired to twist the shaft and note
the movement of the white line at
different points. Additional power is
next gradually applied and the re.
suits noted. Still higher stress is
then provided until the shaft breaks,
this pressure being checked also.
The white line, straight along the
ghart before starting, is found, after
breaking, actually to circle the re-
mainder of the shaft two or three
times, similar to threads on a bolt.
The shaft actually twisted round two
or three times, so tough was its con-
structi0n, before giving away under
the terrific pressure.
Even sheet steel is tested. To the
motor car buyer this may seem
carrying things = bit far as sheet
steel is used only for tenders, bodies
and in a few other places. But
realizing that accidents will happen,
even to careful drivers, Hupmobiles
years ago decided to provide both it's
owners and its cars with every pro.
lection against injury. Accordingly,
even tenders and body panels are
built with remarkable strength.
A multiplicity of such tests reveal
clearly to an engineer the exact
type of material best suited to each
individual part. Hupp engineers
then specify this material and, by
inspection and continued retesting,
know definitely that the materials
specified are actually built into every
Hupmobile car.
II0lLI tn MNVT.