The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1916-10-19
EXPERT AUTO ADVICE

AOtO AOVISE
Can you outline the merits of h
s~emifloatine, three quarter floating and
floating axles and the advantage Of
zach type ovs the other two, it anyf
In the floating axle the weight Of the
car is carried on the axle housing, and
hence the axle shafts are relieved Of
weight. The shaft in this type of axle
may be removed without disturbing
the wheels. The outer ends Of the
axle shafts are relieved also of bending
stresses. The shafts take only torsion-
al stresses in a floating type axle. In
the semifloating axle not only must
the shafts turn the wheels, but they
must take direct load as well. The
shafts cannot be removed unless the
wheels are taken of.
The three-quarters floating axle is
exactly like the floating except in the
method of attachment at the wheel
end. In the floating this Is a flexible
joint, while in the three-Quarters the
shafts are attached rigidly. The lat
ter type of axle has the advantages Of
the floating. but disadvantage in that
the shaf fits are subjected to additional
end stresses due to side slipping. etc.
Has q transformer q low and hiqh
tension windinof
All transformer coils have two wind
ings.
Can you tell mo how to wire q single
cylinder engine so that il will work
both on batteries and a low tension
magnetic? Also will this magnetic burn
out with the friction pulley on and
working properly? How many volts
and how MANI ampsres will tho mag
neto draw II hao not been used for
two years.
1t is quite possible that the breaker
mechanism is improperly synchronizcd
with the armature position. The
breaker points should separate ut the
same time as the magnetic armature is
generating the greatest current by cut
ting the maximum number OF magnetic
lines of force between the poles. This
position of the armature can be de-
termined approximately by rotating
NilC IL hihtbtc oIdit NV bottiiS ~ pO
sition at which the poles exert the
greatest drag. Since the magnetic has
not been used In two years the mag
nets themselves may have become par
tally demagnetized, and In view Of
this probably 1t would be wise to have
the magnetic overhauled. The mag
neto will not burn out with the fric-
! ttnn p,llnr nn md upnr1yinO nnrrantlu
as 1t Is a low tension instrument. Its
voltage should be In the ne~ighborhood
of G.5, and the amperage will depend
upon the speed. .
Will q gasoline motor Of either four
or six cylinders come to "a standstiIi
with any Of ito pistons in the top dead
centor2
If the compression In all OF the cyl
inders is good and the bearings free.
the pistons will not stop at dead cen
ter. The compression resistance will
prevent this.
With a car running at tho rate Of
twenty-five or thirty miles per hour
will the motor assist the brakes in
slowing down If the clutch 10 left en-
gagged and gas h u off?
The brakes are assisted to a great
extent If the throttle is left open, for
the reason that under this condition
the pistOns must work against a volume
Of mixture. With the throttle closed
little air makes its way into the cylin-
ders, and the compression Of n small
amount Of air does not offer the re-
sistance that a chamber full of mixture
does. The method Of using the motor
rs a brake consists In shutting of the
ignition and leaving the throttle open.
this scheme being especially valuable
In descending steep grades, where the
holding power Of the brakes alone is
not considered sufficient to bring the
car to a dead stop In case of emer-
gency.
IL a motor with fast cams and large
valves faster than the regular type
whom II 10 running?
The cams being faster mean that
they are SO designed as to make the
motor operate faster than the regular
type cams.
What 10 the expansion In the metals
ordinarily used in the manufacture OF
valves?
There are two metals usually used
for the manufacture of valves-namely.
nickel steel and tungsten steel. The
former will contain from % to 35 per
cent nickel. The expansion coeficient
will vary from .OOO01131 per degree
centigrade for the % per CEN to
.OOO0OOS5 for the 35 per cent. When
the percentage Of nickel reaches SO
The coefficient Of expansion Is less
than that of any known metal and
amounts practically to zero. The ex-
pansion coefficient Of tungsten steel
is slightly greater than that mentioned
for the nickel steel. and we are unable
to get the exact figure for valve steel.
which usually runs from IL to 16 per
cent tungsten.