Another point is they tend to see more than you want to know about. There
is CC software out there that literally inspects to IPC standards and is
better at it than the operators.

What I mean is if they have line of sight they will see defects. Bubbles,
de-wetting etc. Even if your operators cant!

This means it can be like opening Pandora¹s box. Suddenly, you are in a
position where you don¹t know what to accept and what not to pass.

Tan also makes a great point on materials. Silicones for example generally
don¹t have a great UV fluorescence and can really fool a system. Then you
have the semi transparent nature of the coating interacting with the
colours below the surface. This can also cause problems.

What it really comes down to is some really intense programming to ensure
you minimise the false readings. Do that and you can see a 90% of what
operators do and it works on most PCBs.

A final point is that it also depends on the method of application. If you
are using a selective robot then they are excellent 99 times out of a 100.
After all the robot is spraying line of sight so the system can see it.
You start spraying 3D or dipping and want the system to inspect and Ioan
is right. You need a lot of cameras to do the job!


Best Regards

Dr Lee Hitchens

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On 03/06/2015 20:27, "Richard Kraszewski" <[log in to unmask]>
wrote:

>Would anyone like to share their thoughts on automated coating inspection?
>The good, the bad and or the ugly.
>
>Initial  experience that I have had with them leaves me with the
>impression  that:
>
>	> That are useful to indicate if there is complete lack of coating  on a
>PCA or some specific PCA regions.
>	> can indicate if there is sizable (ytbd)  violation of a keep out zone.
>	> not the best to verify  coverage on some items  such as fine pitch QFP
>leads or  other small SM type components
>	>  except for the case of select spots on a PCA also not the best to use
>as general tool to locate thick fillets or thin coatings on a PCA
>
>As I said above, any thoughts (profound, rants or other) on this matter
>would be appreciated.
>
>Thanks in advance
>
>
>Rich Kraszewski /PLEXUS
>
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