Mark,
Ask your eng. if  the number of different PCB parts exceeds the number of parts feeders the P and P
machines have. If not, you don't have a problem.
Putting the same parts on the same side is a restriction I would not live with. It also lacks creativity.
Why not panelize the PCB so that the array has both primary and secondary PCB sides on the same panel array
side. One PCB in the array must be mirrored (assuming 2-up). This means both sides of the panel have the
same pattern. The paste stencil is the same for both sides of the panel, so is the CIM program and parts
feeders.
--
Scott Buscomb
[log in to unmask]
Techsonic Industries Inc.
Humminbird/Zercom Marine Electronics
1111 Alderman Dr. Ste. 250
Alpharetta, GA 30005
770 475-3020 ext.1032

http://www.humminbird.com




Dean Barham wrote:

>      Mark,
>
>      Think of it like this...Design time is NRE, SMT set-up is recurring
>      expense.  So, if you design it to have multiple set-ups, you design in
>      recurring cost!
>
>      DB
>      Assembly Engineer
>
> ______________________________ Reply Separator _________________________________
> Subject: Re: [DC] Double Sided Part Placement
> Author:  Alan Hall <[log in to unmask]> at SMTPLink-Hadco
> Date:    12/14/98 7:36 AM
>
> Mark Koitmaa wrote:
>
> > I have been asked by an engineer that I am working with to restrict the top
> > side/bottom side placement of parts according to part values (all parts are
> > 0805's).  For example if I place a 10K resistor on the bottom side, all
> > 10K's should also go to the bottom side.  He does not want me to mix parts
> > of the same value between two sides.
> >
> > He tells me this will significantly reduce assembly costs.  I have never
> > heard of such a thing.  Is he correct?  I believe the extra layout time
> > will negate any potential savings in assembly setup.  Any comments?
> >
> > Mark Koitmaa
> > TechServ
> > http://www.techservinc.com
> >
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>
> This is a very common/valid request, if the number of different
>
> part numbers on the board out-number the number of different
>
> part numbers the pick-and-place machine can handle. With too
>
> many different part numbers on one side, the pick-and-place
>
> machine must be set up for multiple runs to complete the
>
> assembly, this adds lots of cost!
>
> --
> Alan Dale Hall
> Design Engineer(PWB Layout)                    Honeywell Inc. - CAS
> Phone: 602-436-1974                  P.O.Box 21111 Phoenix AZ 85027
> FAX: 602-436-2252 Beeper:302-4603 E-mail: [log in to unmask]
>
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