Susan,

One of the flaws we have found with the Camtek AOI stations is that the
annular ring will show as an error if the parameters are not set up
correctly.  There is a way to over-ride the false calls due to annular
ring providing the registration looks good.  The board fabber needs to
call the Tech guys at CAMTEK for some assistance.  I don't understand
how the pad size is bothering the LPI.  You didn't mention line width
and spacing, if it is very tight they may have problems holding the
resist dams.

Sorry I couldn't be more help.

Anne Ledger
EMDS, Inc.

> -----Original Message-----
> From: Susan James [SMTP:[log in to unmask]]
> Sent: Tuesday, August 17, 1999 4:20 PM
> To:   [log in to unmask]
> Subject:      [TN] Board Layout for AOI and LPI
> 
> Dear Experts, 
> 
> One of our board suppliers is telling us they can't do AOI or LPI on
> our older board layouts.  These boards are very low tech being
> 2-sided, 100% thru-hole.  Their issue is with 38 mil holes in 50 mil
> round pads.  They say this doesn't give them enought tolerance for AOI
> or LPI.  They want to increase our pads to 60 mils, which for our
> applications is pretty much out of the question.  They claim they are
> getting nothing but errors from the 50 mil pads.  From my limited
> knowledge about AOI, shouldn't they be able to accomplish this as
> designed by changing the design rules programmed into their Camtek
> system?  Their equipment is a Camtek 2NVT for AOI, and I don't have
> any info on their LPI equipment.  They have been supplying these
> boards for us for about 8 years.  Recently they bought AOI and LPI
> equipment and we would like to see our boards put on this equipment. 
> We do a lot of business with this company, also.  The board house fabs
> to IPC Class 2 specs.    I admit to a definite non-guru status and
> need some advise.  Are our expectations unrealistic?  I hope I've
> given you enough info for reply.  Thanks for your help! 
> 
> Sue James 
> Taylor Company
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