In your message dated Wednesday 13, December 1995 you wrote :
>      Does anyone have any personal experience with "image switching 
>      comparators" such as Vision Engineering's "comparascope". In a visual 
>      inspection process are there any substiantial benefits for this 
>      technique. 
>      
>      Any comments?
>      
>      DDrake
>      Lead Process Engineer - SSDS
>      (713) 987-4365
>      DRAKE@SSDSRDCC
> 
> 
We have used a Vision Engineering Comparascope many years ago and the technique 
is useful in visual inspection. However we found there were too many component 
size and position variations to make it reliable since if everything is moving 
about the defects are more difficult to spot.

If you have very consistent positioning and uniform components then this 
technique could be worth trying. It certainly highlights missing components. 

Thanks for reminding me about our machine which must be gathering dust at the 
moment. Maybe we'll get it out and try using it again.

Paul Gould
Technical Director
Teknacron Circuits Ltd
UK Tel: 1983 866531
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