CEMB USA C72_2 (A) - Manual (Page 17)

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sx
g g
dx
50°
sx
g g
dx
4 g 3 g 1 g 6 g
sx
g g
dx sx
g g
dx sx
g g
dx
GB
5.7 - Unbalance optimization
- This function serves to reduce the amount of weight to be added in order to balance the wheel.
- It is suitable for static unbalance exceeding 30 g.
- It improves the residual eccentricity of the tyre.
- Mark with chalk a reference point on the adapter and rim.
- With the aid of a tyre remover, turn the tyre on the rim by
180°.
- Refit the wheel with the reference mark coinciding between
rim and adapter.
- RH display: percentage reduction
- LH display: actual static unbalance which can be reduced
by rotation.
- Mark the two positions of the rim and tyre, and turn the
tyre on the rim until the positions correspond in order to
obtain the optimization on the display.
RETURN TO MEASUREMENT SCREEN.
TYRE
POSITION
RIM
POSITION
Unbalance already measured No previous unbalance
measurement
unbalance measurement
5.8 - Automatic minimization of static unbalance
This program is designed to improve the quality of
balancing without any mental effort or loss of time by
the operator. In fact by using the normal commercially
available weights, with pitch of 5 in every 5 g, and by
applying the two counterweights which a conventional
wheel balancer rounds to the nearest value, there
could be a residual static unbalance of up to 4 g. The
damage of such approximation is emphasized by the
fact that static unbalance is cause of most of distur-
bances on the vehicle. This new function, resident
in the machine, automatically indicates the optimum
entity of the weights to be applied by approximating
them in an “intelligent” way according to their position
in order to minimize residual static unbalance.
Initial unbalance
phase shift
Possible approximations
residual static residual static residual static residual static
With conventional
wheel balancer
Choice with minimum
static residual