Festo Checkbox Compact CHB-C Series Manual page 105

6. Testing parts
6.3 Influence of tolerance
Band width
Set tolerance
Stop
1 5
1 10
Stop
Festo P.BE−CB−COMP−en en 0503c
When a new parts type is taught, the features of all scanned
parts are recorded. The values of the registered features
differ individually from each other. For each feature there is a
value range (band width) in which test parts are graded as
Good." You can influence this bandwidth by means of the
tolerance setting. Test parts, the features of which lie within
the band width or in the subsequent tolerance range, are still
accepted as good parts.
With 0 % tolerance, only those parts with features which lie
exactly within the band width of the scanned sample parts
will be accepted as good parts. Set therefore at least 1 %
tolerance. This will ensure that good parts will be classified
correctly even if their positions deviate minimally.
The setting is made in the Stop status.
1. Press the button START/STOP, in order to switch the
Checkbox into the Stop status.
2. Press and hold down the START/STOP button while you
increase the tolerance value by pressing the TEACH/
STATUS button, e.g. from 5 to 10 %:
Setting range
Standard setting
Recommendation
3. Release the START/STOP button when the desired value
has been set.
The value selected will be added automatically to the data of
the parts type and saved.
0...20 %
5 %
at least 1 %
6−7