Corghi EM9980 Manuel D'utilisation page 73

BALANCING CYCLE
Sequence of operations to be performed by the
user and the machine from the beginning of the
spin until the wheel is braked to a stop after
calculating the unbalance values.
CONE
Conical element with a central hole which, when
inserted on the wheel balancer shaft, is used to
centre the wheels having central holes with a
diameter ranging between maximum and mini-
mum values.
RUNOUT
This is represented by a sinusoidal wave form
having a specific width, which indicates geo-
metric deformations in the radial direction.
Since tyres and rims are never perfectly round,
there is always a certain amount of runout (or
radial runout first harmonic) for the wheel (or
assembly). If the runout width is greater than a
specified threshold, vibrations may be generat-
ing while driving the vehicle even after an ac-
curate balancing was performed.
The speed at which these vibrations may be
generated depends on the structural features
of the vehicle. Generally speaking, this (critical)
speed is about 120-130 Km/h for common pas-
senger vehicles.
DYNAMIC BALANCING
Procedure for unbalance compensation by
applying two weights, one on each of the two
wheel sides.
STATIC BALANCING
Procedure for correcting only the static element
of the unbalance, by applying only one weight,
usually at the centre of the rim well. Accuracy
increases as the width of the wheel decreases.
RIM SUPPORT FLANGE
(of the wheel balancer)
Circular crown-shaped disk against which the
disk of the wheel mounted on the wheel bal-
ancer rests. Also used for keeping the wheel
perfectly perpendicular to its rotation axis.
FLANGE (adapter - centring accessory)
Device for supporting and centring the wheel.
Also used for keeping the wheel perfectly per-
pendicular to its rotation axis.
It is mounted on the wheel balancer shaft.
EM9980 - Operator's manual
LOCKING DEVICE
Wheel clamping device on the wheel balancer
only used for versions with the automatic wheel
clamping system.
ICON
Symbol displayed on the screen illustrating a
button, indicating the graphic representation of
a control.
SPIN
Procedure starting from the action that causes
the wheel to rotate and the subsequent rota-
tion of the wheel.
OPT
Optimisation abbreviation.
ROD
Acronym of Run Out Detection.
RPA
Acronym of Ricerca Posizione Automatica (Au-
tomatic Position Search).
RUNOUT
Indicates the non-perfect radial and/or lateral
geometry of the wheel.
WOBBLE
It is represented by a sinusoidal wave form hav-
ing a specific width, which indicates geometri-
cal deformations in the rotation axis direction.
Wobble (lateral runout first harmonic) may de-
pend on the fact that the tyre or rim is subject
to wear or geometric-mechanical deforma-
tions, or the wheel (or assembly) has not been
mounted correctly on the threaded hub.
UNBALANCE
Uneven distribution of the wheel mass that
generates centrifugal forces during rotation.
UK
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