Matt Kehoe
SIPAD Systems Inc.
360-C Winkler Drive
Alpharetta, GA. 30004
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770-475-4576 Office
404-680-7977 Cell
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* M31372*
On Wed, Jun 26, 2013 at 2:40 PM, [Jeffrey] [Jenkins] <
[log in to unmask]> wrote:
> Hi Bill,
>
> I've been using the schematics to create BOMs for well over 15 years now
> on small (10 parts) to large (3000+ parts) designs. In general I've had
> little issue with doing this as it has always been my view that the sch,
> pwb, cca and bom are tied together. For us it's always been best to get
> the exact part defined in the schematic, which than drives netlist and
> symbols for the board (R,L,C values may in flux, but package usually
> defined).
>
> On most of the systems that I've used since I entered the industry, the
> schematics have been the driver pushing forward the netlist and the parts
> to used in the design. It only seems reasonable to also create the BOMs
> from it as well. I've done this both with Orcad Capture and DxDesigner.
> With CIS and DxDatabook, it makes it easy to create boms from here and
> have consistent data.
>
> It does mean that the schematics and the bom must always be synced, but
> this is a good thing because then it means that the techs using the
> schematics have a design that matches the bom used to assemble the board.
> There are few things worse than having out of date schematics (I've been
> on that end). And with the advent of intelligent PDFs, the information for
> repair is at the techs fingertips.
>
> There have been instances in the past where only the bom was updated, and
> not the schematic, but that can be resolved with good reviews on the ECNs
> and proper training/encouragement.
>
> I do place "non-electrical" items on the schematic, such as mounting holes
> and fiducals as a reminder for me. I typically only place items that would
> be on the pwb though.
>
> I don't use the assy drawing to list a bom at any point because it won't
> drive our MRP system. We need a bom that is released.
>
> Could one use the schematic to drive other parts? I see little reason
> someone couldn't use symbols to hold other items such as screws, nuts,
> bolts or whatever. But the issue there would be that they would need to be
> stripped from the netlist as not to muck with the layout work. We do
> occasionally do chassis or box wiring with the schematic tool and other
> hardware would be part of this. So it would be reasonable in these cases.
>
> As for whether it's right or wrong, it all depends on the processes being
> used. Having been in a place where I've had to oversee projects with
> different methodologies, meaning some with boms from the schematics and
> some with boms independent of the schematics, I've generally seen less
> mistakes with the boms created from the schematics.
>
> In the end, it's probably what works best for the team.
>
> Best Regards,
>
> -Jeffrey
> Jeffrey A. Jenkins CID+,CIT
> PCB Staff Designer || L-3 Linkabit || Ph: 858-552-9832 ||
> [log in to unmask]
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
> Brooks, William
> Sent: Wednesday, June 26, 2013 11:10 AM
> To: [log in to unmask]
> Subject: [DC] Questioning the trend to use the schematic diagram as a Bill
> of material generation source
>
> I want to examine and get input on is the trend to use the schematic
> diagram as a Bill Of Material or BOM/Parts List generation sole source...
>
> This subject is on my mind more and more and I think it needs an in depth
> discussion.
> What I see happening is engineers who have not had formal drafting
> training using the schematic as a vehicle to automatically create a
> complete BOM for a PWA or PCA depending on where and how you term the
> printed circuit assembly with all the components installed.
>
> The traditional documentation guide book for drafting of electronic
> systems has its roots in the Department of Defense standards... which were
> adopted and published by Global Engineering Documents in a Drawing
> Requirements Manual which is now in its 11th edition authored by JEROME H.
> LIEBLICH. If you want to review it, you can find it at www.global.ihs.com
>
> On a separate evolution line is the CAD or EDA companies that create the
> tools that have been used since the computer was starting to become a
> graphics engine... we can thank them for the creation of drafting tools
> that do more than just draft a drawing... without them we would not have
> our boards done in the time constraints we enjoy today...
> My experience predates the computer so I remember using a drafting table
> and light table to create my boards...
>
> According to historical standards, the controlling document for a Printed
> circuit assembly is the Bill of Material or Parts List and an Assembly
> drawing...
> All revision control stems from this document that lists the electrical
> and mechanical parts and processes including the bare board that make up
> the PCA. The Assembly drawing is the controlling document by which the part
> is assembled and inspected.
>
> Traditionally the Assembly Drawing was considered the first sheet of a
> parts list... often if the list was small it would be documented right on
> the Assembly drawing... but since more often there were so many parts to
> list we usually made a separate Parts List (Bill of Materials) but it kept
> the same part number as the BOM and ASSEMBLY drawing and the revision
> letters typically tracked... though provision was made in the DOD specs to
> handle the revs separately too, as long as it was referenced on the BOM. So
> the BOM was the master top level controlling document for building a
> PCA/PWA.
>
> The way I am seeing the CAD tools being used nowadays is to drive the BOM
> from the schematic diagram... and because of this many designers and
> engineers are creating symbols for non-electrical or mechanical parts on
> the schematic to get the BOM to generate a complete bill of materials for
> the PCA.
>
> Should we be doing this... ???
>
> All of the implications may not be so obvious to everyone... I would like
> to get other professional's opinions and observations regarding this
> practice ...
>
> Best regards,
>
>
> William Brooks, CID+
> Senior MTS (Contract)
> 2747 Loker Ave West
> Carlsbad, CA 92010-6603
> 760-930-7212
> Fax: 760.918.8332
> Mobile: 760.216.0170
> E-mail: [log in to unmask]
>
>
>
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