Rockwell Automation 5370-CBPK Color CVIM BLISTER-PAK Option - Manual (Page 22)

Chapter 5
Auto Setup
5–2
Figure 5.1
Example: Onscreen Calculator Keypad
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Teach Count
The last step of the auto setup process involves “teaching” the system by
examining a specified number “good” sample blisters. This enables the
system to determine the expected values of each object, and the expected
variation of these values, during production inspection operations.
The teach count parameter determines the number of sample blisters the
system should examine during the auto setup process before calculating
range values for the position, area, and shape tolerance parameters. Because
the teach count setting determines the sample size, it has a direct effect on the
statistical validity of these calculated range values.
A low teach count requires less time when performing the “teach–in” step
than a high teach count. However, with a low teach count you may not
observe the complete range of variation that is likely during actual
production. The result of a small sample size could be excessively tight
tolerances, resulting in false rejects. On the other hand, a high teach count is
likely to more accurately represent the range of variations that can be
expected during actual production.
Note that the variation scale setting discussed on page 5–6 can be used to
expand the taught tolerance values slightly. This capability can help
compensate for the narrowed range of variation that the system may
encounter with a low teach count.
When you select the Teach Count menu item, an onscreen calculator
appears, on which you can enter a teach count value between 0 and 1000.
The teach count value in the default configuration is 0. (When the teach
count is 0, the inspection tolerances will simply be set to the minimum
tolerance values as defined in the following sections.)