Johannes,

P/N = Part Number

Aperture Wheel = Definition carried over from the time that photoplotters
used an actual wheel with openings (apertures) corresponding to the
pad/trace geometry. With laser plotting now the norm, the listing of
plotter shape definitions is now commonly referred to as the Aperture
Wheel.

Program/Script = A method of automatic loading of customer aperture
definitions into CAD or photoplot systems. These tend to be very specific
to the systems in use and are typically generated by the fabricator. With a
standard aperture wheel, only one script would be required. If your design
system can output Gerber files per RS-274X, your supplier should be able to
autoload apertures from these files.





-----Original Message-----
From:   Johannes Sivula [mailto:[log in to unmask]]
Sent:   Friday, May 08, 1998 10:06 AM
To:     [log in to unmask]
Subject:        [TN] Aperture Wheel ? P/N ?

Hi,

Perhaps there is someone who knows what this is about:

We tried out a new pcb supplier. The first protos were fine, and we
purchased a bigger batch.
Even these pcb?s looked fine, with an exception; All the pads were
rounded,
so they haven`t
used our apertures at all !!
Rounded apertures are for my part OK, but question remains, how this could
possible happen.
I asked this question and I got this as an answer:


     "The reason of the problem is human error.  For any new P/N we load
the Aperture
      Wheel in our Cad system in this case the operator made a mistake (
didn't consider
      the shape 1-2).
      To avoid this problem on the future production, we propose:
      -Aperture wheel standard
      -Specific program-script to load the aperture wheel in automatic way
in our Cad system"

Forgive my ignorance, but I don`t know what is:

-P/N
-Aperture Wheel
-Which kind program-script is he/she referring to ?

I am asking this because so far I haven`t got the answer  from the
supplier. I am just curious.

Brs, JoSi

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