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13. CALIBRATION
The balancing machine has a self - calibration system allowing the user to tune the machine
himself. Calibration is to be performed if inccorectindications are suspected (due to ageing of
electronic components temperature effects , shocks in transport etc.)
Calibration should be performed as follows:
1. Set balancing machine computer in subroutine CALIBRATION ( see item 8.10.)
Select test a car wheel of know parameters and if possible, of small unbalance and mount it in
the balancing machine fixture. Enter diameter and width data in machine memory, using
apporiate push - buttons on balancing machine keyboard (see items 8.3.1-8.3.3). Enter distance
by means of edge finder pushing it against wheel rim edge. Set cut - off threshold to minimum
value i.e. 2g.
May be automatic start.
2. Tab a weight of 80 g anywhere on the outer edge of wheel rim.
3. Push - button
or automatic start . The measuring cycle ends with automatic
braking of the balancing machine spindle and display „1” 0 and display „2” 79 or 80. (Fig.33).
NOTE:
Apperance of different values means an error in calibration. The cause may be e.g. substantial
unbalance of the wheel used for testing. In such - case you have to shift a weight of 80g by 180
(tab it as opposite in relation to its former position - of course, on the outer edge of wheel rim)
and repeat the process of calibration.
4. Remove the weight of 80 g. Set balancing machine computer in subroutine UNBALANCE
Fig.33.
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2
