4. Teaching parts
4-10
Festo P.BE-CB-COMP-EN en 1102d
4.2.2 Observing the scatter of characteristics
C...
Observethedisplaywhenscanningthesampleparts.It
shows briefly for each part the maximum value of the scatter
of characteristics for the current feature which differs to the
greatest extent (C-value).
The following factors influence the scatter of characteristics:
– parts geometry
– different contours of the part, depending on the swivel
angle around the longitudinal axis (e.g. with springs,
screws)
– different positioning on the conveyor device.
If the displayed C-value changes erratically, you have prob-
ably placed the conveyed part incorrectly on the conveyor
device. If the C-value changes only minimally, a sufficient
scatter of characteristics in the current orientation has prob-
ably been achieved. The optimum situation is when the curve
of the values changes at first considerably and then becomes
increasingly more constant.
Small values indicate narrow manufacturing tolerances and a
steady supply of par ts. Very large values indicate that the
taught sample parts differ greatly from each other with
regard to their properties. If the (good) parts are allowed to
differ greatly from each other, the Teach procedure can
nevertheless still be continued.
C-value
Significance
. 10 Sample parts are very similar in all features
, 30 Large scatter of at least one feature
An exact description of the calculation algorithm for the scatter of
characteristic s can be found in Appe ndix A.3.2.
Tab. 4/1: C-value (scatter of characteristics)
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