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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