Doug,
"thou shall not do this" are very hard to define.  Nothing can replace
mentor and training plus hands on for design.  the std should define
minimum requirements of "you must do this"... hard to define all the
stupid mistake that pop out of some of the newbie's head... like the dead
bug (pinout were mirror image flipped... so you have to mount the part
facing sky and hard wire each pin.. don't laugh, it happened twice -
prototype, and later rev, someone decided to get the rev 0 dwg and modify
other area of layout ... - thanks god it is a long time ago).
            jk
> 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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