Bruce,

Invocation of general design, workmanship, quality and performance  standards
are usually defined by the end user or the company creating the  product.
There is usually a general statement of work which calls out for the  basics with
very definitive references on individual drawings.

You also ask why assembly requirements are located in the design standards.
Simply, the assembly requirement must be designed into the product at the
beginning. Thereby, enabling the assembler to assure his workmanship meets the
intent of the design.

Regards,

Gary Ferrari
Ferrari Technical Services
860-350-9300


In a message dated 1/4/2005 9:38:55 AM Eastern Standard Time,
[log in to unmask] writes:

I know  this has been discussed at length in the past, but I can not find an
answer  to this question in the archives.  I am hoping one of you ( or  maybe
even Jack) can answer this.  J-STD-001 talks at length about not  violating
minimum electrical clearance.  I know that IPC-2221A has  requirements for
both the PWB and the assembly with regards to minimum  electrical clearance.
However, how does one make the connection between the  two?  There is no
direct reference that I can find that pushes you to  2221 to look for this
information.  Also, and this is for Jack or  those that were involved with
creating these specs, why are the assembly  requirements located in the PWB
design spec?

Bruce  Stilmack
GDLS-TO Manufacturing Engineer
(850)  574-4773
[log in to unmask]

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