ing 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 perpendicular to its rotation axis.
Mounted on the shaft of the wheel balancer
by means of the central bore.
RING NUT
Wheel blocking device on the wheel bal-
ancer, fitted with elements for coupling
with the threaded hub and side pins for
tightening it.
SPIN
Procedure starting from the action that
causes the wheel to rotate and the sub-
sequent rotation of the wheel.
THREADED HUB
Threaded part of the shaft on which the
ring nut is engaged to lock the wheel. It is
supplied disassembled from the machine.
UNBALANCE
Uneven distribution of the wheel mass
that generates centrifugal forces during
rotation.
SENSOR (measuring arm)
Mobile mechanical element that, when
brought into contact with the rim in a spe-
cific position, measures the geometric data:
UK
distance, diameter. Data can be measured
automatically if the sensor is equipped
with suitable measurement transducers.
User manual ProLine 640
67