Rick,

When I was first asked to "eyeball" the area of a piece of film for 
plating purposes, I went a little wild, insisting that the only way 
to do this properly, especially considering that the majority of 
our jobs were done digitally, was to invest in the proper equipment, 
ie a "Kahn" or equivalent.  Well with words like "Capital Equipment", 
"Budgets" and the like, they finally beat me down, and I succumbed to 
doing the "estimations" by eye.  

Well, with the exception of a few blatant errors, everything seems to 
work fine, at least within the technology limits of the jobs we had 
on film only.

For the last year, we no longer accept jobs on film only unless we 
scan them.

Regards

John Parsons

> Date:          Fri, 09 May 1997 06:40:15 -0400
> To:            [log in to unmask]
> From:          RICK TAORMINO <[log in to unmask]>
> Subject:       fab - copper area calculation

> Our CAM software calculates copper area on the top and bottom surfaces, as
> well as in the holes according to the material thickness.  This works well.
> 
> Calculating the area on film however is another story.  We used to have a
> kahn machine which would not (and could not) give consistent readings.  We
> resorted to "eyeballing" the total square inches, which was not reliable either.
> 
> I'm wondering how the rest of the industry calculates the copper area on
> film.  Does anybody even deal with film anymore, or do they get it scanned
> into gerber files?
> 
> Thanks in advance for your input.
> 
> Rick
> 
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