V. Bada

   DFM also depends on your current work environment, based on that you will
create your DFM rules.
   For instance we used a pick and place machine that has nozzle separated
by 8mm distance, in this way, is desirable that at board we have components
with same distance in order to do double placement at same time. We also set
the boards to the same width to avoid conveyor set up at SMD machines and
Manual insertion lines.
   Not always good for you will be good for others. Project / SMT / Auto
Insertion / Manual Insertion / Wave Soldering / Assembly / Test / Packing
has to work together to avoid conflicts. Team work is the best solution.
   For SMT first you have to known your equipment and identify what
situation is better in terms of quality and machine performance, you have to
identify uninsertable area ( locals that machine can't put any component ),
try to keep polarized components at same direction ( easy inspection ),
consider use of Resistor / Capacitor network ( this reduce production cycle
time ), boards with same width reduces machine set up , local fiduciais for
fine pitch devices, CAD library updated, etc ...
   Team work is very important and CAD library updated also if you can't
have that, is better forget DFM as global tool.


 Thanks
 Jorge Santana
 Process Engr
 Microtec - Brazil


> -----Original Message-----
> From: BADA [SMTP:[log in to unmask]]
> Sent: 6 de Abril de 1999 03:08
> To:   [log in to unmask]
> Subject:      [TN] Design for manufacture
> Sensitivity:  Confidential
>
> I'd like to find some good information about design for manufacture of SMT
> assemblies.
>
> If you know where I can find some information on how to design boards to
> get
> the highest manufacturability, please let me know.
>
> Thank You,
>
> V.Bada
> Process Engineer
> Alcatel Etca
> Belgium
>
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