Hofmann Megaspin 800, Руководство по эксплуатации

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5.7 - RUN-OUT MEASUREMENT (OPTIONAL)
The figures indicate the, much amplified, outer surface of the tyre and the wheel rotation axis.
Fig. A shows total Peak-Peak run-out
measurement, defined as maximum radial
deviation of the tyre surface.
Fig. B shows the 1st harmonic run-out
measurement, or the run-out of the rim that
"recopies" the shape of the tyre, mediating the
local deviations of the tyre from round shape.
Obviously, the P.P. measurement is normally
greater than the 1st harmonic. Tyre manufacturers normally provide two different tolerances for the two
run-outs.
After making a balancing spin, the measurement of the tyre run-out can be made automatically by means
of the SONAR sensor on the cover. The sensor must be manually positioned in front of the tread.
Fig. A
Fig. B
Epp
E1h
GRAPH 1 : represents the real Peak-Peak run-out
GRAPH 2 : represents the first harmonic run-out. For a wheel in good condition, this graph should appear
almost as a straight line.
By moving the wheel, the cursor indicates current value, with the phase referring to the
correction point.
GRAPH 1 - (yellow)
GRAPH 2 - (red)
End
RUN OUT
Max./Min.
1st harmonic
Position
For 1st harmonic, the maximum deviation usually should not
exceed 1,2 mm. In the latest software the sysmbol above button
no. 4 changes to red as soon as this value is too high.