Dwight,

As a suggestion, if you have DfM guidelines that work, you might make them
available to Gary Ferrari, who leads the IPC-2221 and -2222 design
standards.  The more we manufacturing people can do to let designers know
what causes is pain, the better off we will be.


Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins

On Wed, Oct 21, 2015 at 9:47 AM, Mattix, Dwight <[log in to unmask]>
wrote:

> Edit to add:
> Got a whole 'nother set of design for assembly Mfg Eng guidelines and
> assembly quality workmanship guidelines to fill gaps (we perceive) in IPC
> workmanship guidelines.
>
> Back in the basestation days... We had an internal circuit assembly rework
> and repair document I published that harmonized our allowed repair/rework
> methods, IPC workmanship and customer (Nortel at the time) rework&repair
> standards. An interesting Venn diagram problem, that was.
>
> -----Original Message-----
> From: Mattix, Dwight
> Sent: Wednesday, October 21, 2015 7:40 AM
> To: [log in to unmask]; 'Peter G. Houwen' <[log in to unmask]>
> Subject: RE: [TN] IPC-A-610
>
> "I couldn't solder it right, it's precluded by your design".
>
>
> Fwiw, It's a pwb fab note. Not an assembly level note.  So, your concern
> is valid but mute. :)
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter G. Houwen
> Sent: Wednesday, October 21, 2015 7:00 AM
> To: [log in to unmask]
> Subject: Re: [TN] IPC-A-610
>
> 'A note "Shall meet IPC Class x ,blah blah, except where precluded by
> original design" doesn't sound like the correct approach to me - it could
> unintentionally result in the designer not getting vital feedback from the
> fabricator and assembler.'
>
> James makes a good point.  It also makes it easy for the assembler to say
> "I couldn't solder it right, it's precluded by your design".  Much better
> to add "Except as noted", then make sure it's noted.  Makes for better
> design discipline and is more likely to get a response from manufacturing
> if you accidentally missed something.
>
> Pete
>
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