Dynamic Balance Dynamic balance
Is the equal distribution of weight on each side of the centerline. When the
balanced tire spins, there is no tendency for the assembly
to move from side to side. Wheels that are dynamically
unbalanced can cause wheel shimmy and a wear pattern
(Figure 42-19). Dynamic balance, simply stated, means
balancing a wheel in motion. Once a wheel starts to rotate
and is in motion, the static weights try to reach the
true plane of rotation of the wheel because of the action
of centrifugal force. [n an attempt to reach the true
plane of rotation when there is an imbalance, the static
weights force the spindle to one side.
At 180 degrees of wheel rotation, static weights kick
the spindle in the opposite direction. The resultant side
thrusts cause the wheel assembly to wobble or wiggle.
When the imbalance is severe enough, as already mentioned,
it causes vibration and front-wheel shimmy.
To correct dynamic unbalance, equal weights are
placed 180 degrees opposite each other, one on the inside
of the wheel and one on the outside, at the point of
unbalance. This corrects the couple action or wiggle
of the wheel assembly. Also, note that dynamic balance is
obtained, while static balance remains unaffected.
The most commonly used dynamic wheel balancer
requires that the tire/wheel assembly be taken off and
mounted on the balancer's spindle (Figure 42-20).the
machine spins the entire assembly to indicate the heavy
spot with a strobe light or other device. Two tests must
be done, one for static and one for dynamic imbalance.
One set of weights is placed to correct for static imbalance,
and others are placed to correct for dynamic
imbalance. Sometimes proper positioning of the static
balance weights also corrects dynamic imbalance.
There are several electronic dynamic/static balancer
units available that will permit balancing while the wheel
Dynamic Balance Dynamic balance
Is the equal distribution of weight on each side of the centerline. When the
balanced tire spins, there is no tendency for the assembly
to move from side to side. Wheels that are dynamically
unbalanced can cause wheel shimmy and a wear pattern
(Figure 42-19). Dynamic balance, simply stated, means
balancing a wheel in motion. Once a wheel starts to rotate
and is in motion, the static weights try to reach the
true plane of rotation of the wheel because of the action
of centrifugal force. [n an attempt to reach the true
plane of rotation when there is an imbalance, the static
weights force the spindle to one side.
At 180 degrees of wheel rotation, static weights kick
the spindle in the opposite direction. The resultant side
thrusts cause the wheel assembly to wobble or wiggle.
When the imbalance is severe enough, as already mentioned,
it causes vibration and front-wheel shimmy.
To correct dynamic unbalance, equal weights are
placed 180 degrees opposite each other, one on the inside
of the wheel and one on the outside, at the point of
unbalance. This corrects the couple action or wiggle
of the wheel assembly. Also, note that dynamic balance is
obtained, while static balance remains unaffected.
The most commonly used dynamic wheel balancer
requires that the tire/wheel assembly be taken off and
mounted on the balancer's spindle (Figure 42-20).the
machine spins the entire assembly to indicate the heavy
spot with a strobe light or other device. Two tests must
be done, one for static and one for dynamic imbalance.
One set of weights is placed to correct for static imbalance,
and others are placed to correct for dynamic
imbalance. Sometimes proper positioning of the static
balance weights also corrects dynamic imbalance.
There are several electronic dynamic/static balancer
units available that will permit balancing while the wheel
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