Johannes,

Seems to me the easiest solution would be to submit your files with
embedded apertures (RS-274X). Otherwise you need to supply an aperture
list with every design (do not rely on your CAD system unless it uses a
fixed aperture list, PADS doesn't EED3 does yours might). Your Vendor
should load your apertures for each plot (advantage to RS-274X, loading
is automatic thereby limiting human error possibilities). 


-P/N                            Part Number
-Aperture Wheel         old Gerber photoplot used 8 position wheel to
accomplish apertures
-Program-Script         Loads apertures into CAD system. You would have
to create this batch file as one of your standard output files.


Personally I feel the Aperture issue is one of Vendor Quality. 
It is important to remember a Vendor's data is only as good as the data
you send them.
If a Vendor does not give you what you expect than you must expect
suprises.


Hope this helped
FNK

Frank N Kimmey
EM Designer
C&K Systems, Inc
916-353-5366
[log in to unmask]



> ----------
> From:         Johannes Sivula[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Johannes Sivula
> Sent:         Friday, May 08, 1998 7:06 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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