WHEELS
AND
TYRES
troubles develop, and mechanical
in-
vestigation fails to disclose
a
possible
cause, wheel and tyre balance should
be suspected.
A
Tyre Balancing Machine is marketed
by the Dunlop Company to enable
Service Stations to deal
with
such
cases. This is shown
in
Fig.
15;
a
second, marketed by Messrs.
V.
L.
Churchill Ltd.,
in
Fig.
16.
Dynamic
Balance
Static unbalance
can
be measured
when the tyre and wheel assembly is
stationary. There is another form
known as dynamic unbalance which
can
be detected only when the assem-
bly is revolving.
ELECT
U
P
eccentric wheels give the same effect.
During rotation the offset weight dis-
tribution sets up a rotating couple
which tends to steer the wheel to
right and left alternately.
Dynamic unbalance of tyre and wheel
assemblies
can
be measured on the
Dunlop Tyre Balancing Machine and
suitable corrections made when
cars
show sensitivity to this form of un-
balance. Where it is
clear
that
a
damaged wheel is the primary cause of
severe unbalance it is advisable for the
wheel to
be
replaced.
6.
CHANGING
POSlTION
OF
TYRES
There have been references to irregular
tread wear and there may be different rates
SPINNER
MOTOR
WEIGHT
TOOL
&
WEIGHTS
Fig.
16
Chnrchlll
to
Electronic
Wheel
Balance.
WHITE
TAPE
There may
be
no heavy spot-that is,
of
wear
between one tyre and another. It
there may
be
no
natural
tendency for
has also been stated that irregular wear is
the assembly to rotate about
its
centre
confined almost entirely
to
front tyres and
due to gravity-but the we@t may
be
that the left-hand front tyre is likely
to
be
unevenly distributed each side of the
more affected than the right-hand front
tyre centre line (Fig.
17).
Laterally tyre.
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