October 6, 2008
Check out IPC-2221/IPC-D-325 drawing requirements; it may answer your
question. Also, the IPC has recently developed a series of standards that
will replace IPC-D-325. These new standards are intended to form a series
of electronic formatted PWB and PWA documentation requirements, including
what some folks at IPC call the "Perfect BOM".
With regard to SAP, we have several OEMs who use SAP; however, drawing
numbers are generated via CAD and not SAP. If your CAD system does not talk
electronically directly to SAP, this normally requires someone to manually
re-enter the BOM information from the CAD drawings into SAP. This is double
work and increases the risk of errors between the two different electrtonic
databases.
>From: "Kuczynski, Michael (MED US)" <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>, "Kuczynski,
>Michael (MED US)" <[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] PCB Documentation
>Date: Mon, 6 Oct 2008 19:07:14 -0400
>
>Our company has begun "Corporate Initiates", where we're trying to align
>multiple sites in using the same practices, shared resources, blah,
>blah, blah. One of the many "teams" formed is addressing part numbering.
>
>Now each and site (as well as everyplace I've EVER worked), in regard to
>part numbering for printed circuit boards has been similar. There is a
>base number and all the related reference documentation contains that
>base number, but is unique'd by prefix and/or suffix. So there was never
>any doubt/guessing what the part number for a drawing was. Example:
>(each drawing has a separate revision)
>
>12345-1:A (bill of materials/parts list)
> AW12345:A assembly drawing
> DR12345:A drill/fabrication drawing
> PA12345:A schematic drawing
> PC12345:A artwork/gerber files
>
>(we no longer us "smart part numbering" for components - its just
>random, sequential numbers) We will be transitioning/migrating to parts
>database management system, SAP. Because the system can not
>"automatically generate these part numbers" (as we're use to seeing), it
>wants to "auto-generate" part numbers. So it may look something like:
>
>12345678
> 12345679 assembly drawing
> 12345683 drill/fabrication drawing
> 12345689 schematic drawing
> 12345721 artwork/gerber files
>
>I need supporting "business reasons" WHY we CAN'T use random
>auto-generated part numbering for our documentation. Their argument is
>anyone who has access to the SAP system, can find what their looking
>for, so the part numbers don't matter. When we send our data out to the
>vendors for fab and assembly, we send all the supporting documentation.
>
>So aside from thinking this is stupid and the ol' "it's ALWAYS been like
>that, I'm finding a hard time shooting holes in their argument.
>LOGICALLY, the way its always been, seems best, but unless I come up
>with some supporting/alternate views, this is going to be a confusing
>mess.
>
>So if anyone can help me out here - please help me stop the insanity.
>(or maybe I've been "integrated" too long)
>
>Thanks In Advance
>
>
>SIEMENS
>Michael Kuczynski Medical Healthcare Diagnostics Inc.
>Product Eng. II CID 511 Benedict Ave.
>914-524-3118 (Ph) Tarrytown, NY
>914-524-3322 (Fax) Mail Stop P25-1-C
>[log in to unmask]
>
>
>
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