38
12. MINIMISATION INSTRUCTIONS
Minimisation is a test allowing such positioning of tyre in relation to wheel rim that minimum
radial run - out of complete wheel in obtained.
Minimisation test is to be carried out with wheel guard up.
Set balancing machine computer in MINIMISATION subroutine as described in item.8.6.
Mount wheel rim ( without tyre ) in machine chick so that valve hole is directly situated opposite
markers on spindle and chuck (Fig.4).
Set run - out as described in Section 11.
Rotate wheel rim in direction shown by arrow on balancing machine housing above the spindle.
Commencement of measurement process is signalled by chime and display of WHEEL RIM
RUN - OUT MEASUREMENT IN PROGRESS. Rotate wheel rim slowly until chime signalling the
end of the measurement is heard. On the screen, message WHEEL RIM RUN - OUT VALUE will
be displayed showing run - out value in milimeters.
Remove wheel rim from chuck, fit tyre and inflate to specified pressure. Mount complete wheel
in balancing machine chuck so that the valve is directly opposite the markers on chuck and
spindle . Depress key
. TYRE RUN OUT MEASUREMENT will appear on monitor
screen, to be replaced, after a while with SET SENSOR. Set sensor as described in section II.
Rotate whell so that chime is heard and TYRE RUN OUT MEASUREMENT is displayed on the
screen. Rotate wheel further until chime signalling the end of yhe measurement is heard.
Message TYRE RUN OUT VALUE will appear on monitor screen with run out value in milimeters.
Depress key
. Image shown in Fig. 32. will appear on monitor screen.
Now locations of max. wheel rim and tyre run - out are to be determined by rotating the wheel by
hand and watching indicators „1” and „2”
When indicator „1” reaches the topmost point of the wheel symbol (a sound will then be heard)
mark with chalk the wheel rim at its topmost point in vertical plane through spindle centre line.
Rotate wheel so that indicator „2” reaches the top of the wheel symbol and mark with chalk tyre
at its topmost point in vertical plane through spindle centre line.
Remove wheel from chuck and move tyre in relation to wheel rim so that chalk marks on wheel
rim and tyre coincide.