Outfit; Optional Accessories; What A Wheel Aligner Is; Characteristic Angles - Corghi EXACT 70 Manual De Uso

Eichstädt Elektronik - Professionelle Kfz-Diagnosegeräte

oUTFIT

Pedal depressor device
Steering wheel clamp device
Remote control transmitter
CD-ROM with program
Operator's Manual
Spare parts handbook
Original accessories handbook

oPTIoNAL ACCESSorIES

For the full list of optional accessories for the EXACT
70 wheel aligner, refer to the "ORIGINAL ACCESSO-
RIES" handbook supplied with the aligner. For the
function enabling kits and databank update kits,
refer to your dealer's price list.

wHAT A wHEEL ALIGNEr IS

An aligner or wheel aligner is defined as an in-
strument for measuring characteristic alignment
angles of a vehicle (see the "Characteristic angles"
section).
A wheel aligner consists of a central unit and four
measuring sensors for application to the wheels
of the vehicle.

CHArACTErISTIC ANGLES

1) ROC (Run Out Compensation). Off-centre and
plane error compensation.
ROC renders the angle measurements independ-
ent of geometrical errors in the rim and/or wheel
mounting.
This procedure should be performed on all
wheels.
2) Toe.
Angle formed by the equatorial plane of the wheel
and the axis of symmetry or thrust axis of the vehicle
(figs.10 and 11).
The axis of symmetry of the vehicle is the imaginary
line which divides the vehicle in half lengthways,
while the thrust axis is the travel direction estab-
lished by the rear axle.
The units of measurement of toe are the degree
and the millimetre.
3) Camber or Inclination.
The angle formed by the equatorial plane of the
wheel and the vertical plane (fig.12): camber is posi-
tive when the top of the wheel tilts outward.
The unit of measurement of camber is the degree.
Operator's Manual EXACT 70
4) Caster.
The angle formed between the vertical and the
projection of the steering axis onto the longitudinal
plane of the vehicle (fig.13).
Caster is measured by locking the steering to 10°
or 20°.
The unit of measurement is the degree.
5) King pin angle.
The angle formed between the vertical and the
projection of the steering axis onto the transverse
plane of the vehicle (fig.14).
King pin angle is measured by locking the steering
to 10° or 20°.
The unit of measurement is the degree.
6) Steering angle difference.
The difference between the values of the steering
angles of the front wheels; by convention it is meas-
ured when the wheel on the inside of the bend is
locked to 20° (fig.15).
The unit of measurement is the degree.
7) Misalignment of wheels on the same axle or
Set-Back.
The measurement of the difference in position of
one wheel in relation to the other, referred to the
perpendicular of the vehicle's longitudinal axis
(fig.16).
There are both front set-back and rear set-back; the
latter is not to be confused with the thrust angle.
The unit of measurement is the degree.
8) Thrust angle.
The angle formed between the axis of symmetry
of the vehicle and the travel direction of the rear
axle (fig.17).
The unit of measurement is the degree.
9) Track difference.
Angle formed by the line joining the ground contact
points of the front and rear wheels on the left-hand
side and the line joining the ground contact points
of the front and rear wheels on the right-hand side
of the vehicle (fig.18).
The units of measurement of track difference are
the degree or the millimetre, only if the wheel
base is known.
10) Wheel base difference.
Angle formed by the line joining the ground con-
tact points of the front wheels and that of the rear
wheels (fig.19).
The units of measurement of wheel base difference
are the degree or the millimetre, only if the track
is known.
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