Hi Bill:
Greetings from a neighbor to the north. Won't be long now before the snow starts to fly. Hopefully El
Nina won't treat us too badly despite CDR Tom's warnings.
As for FAB instructions, it sounds like you imbed not only the fab instructions but ALL the traceability
possible in your drawing packages.
Here at Amherst, we are very explicit regarding the fab process documentation but we differ on the
traceablity issues. We track document revisions on the front or title page and at the bottom of each
page. The ECN documentation is held by document control and is referenced at the upper right corner of the
title page.
The title page of the AW package for the most part is where all the fab notes and special instructions go.
We include a fab drawing on the next page for use by the board vendor and our incoming inspection to pin
down the details of any milling, tooling hole locations, fiducials, and overall board dimensions. We use
PADs POWERPCB to add the notes. We have a mechanical design department in charge of whipping up
dimensioned drawings of circuit card form factors in Autocad r14. They typically provide us with dxf
output which we then import into PADs for the mechanical fab drawing. The PWB artwork and drawing are
archived in gerber format.
For our in-house board assembly we don't include a flowchart. Rather we structure the drawing in "levels"
of assembly. It usually goes through SMT top, SMT bottom, TH top and if applicable but hardly ever TH
bottom. At each level, the smt line technician or board assembler and the in-process inspector is provided
with a complete detailed graphic representation of the board at the end of that level. There also are
notes at each level giving special instructions on how to complete that level. This CCA drawing, in
Autocad r14, is the responsibility of the mechanical design dept. with synergistic input from digital
design. The production department uses proprietary database software from the digital design department to
program the smt line (pick and place). Any manual final assembly processes are completed using the
aforementioned assembly drawing and a database to map PL item #s to reference designators.
I don't know what the current release of wordperfect is but I'm willing to bet that they may have Object
Linking and Imbedding capabilities (OLE) which can be used to essentially insert your documentation into
another application, like Autocad, like PowerPCB. Linking your fab documentation to the assembly drawing
affords YOU the advantages of application familiarity and the power of a wordprocessor in conjunction with
a CAD package. Also, not to besmirch assemblers BTW, but the assemblers also benefit from a more
"idiot-proof" document package.
Kasprzak, Bill (esd) US wrote:
> To all technetters:
>
> I am curious as to the kinds of software packages that folks use to generate
> work instructions for the shop.
>
> By work instructions, I'm referring to a document that is considered to be
> "under control".
>
> This is the format that we use..........
>
> We have a cover page which lists the part number being built, the revision
> of the document, the revision of the bill of materials for the part being
> built and a listing of the revisions of each page in the document.
>
> The second page is a History page which gives all of the revisions made to
> the document, the pages affected at the time of the revision and a brief
> description of what the reasons were for the changes made.
>
> The third page is an advisory page which informs the operator of general
> information about the item being built. The information speaks to ESD
> requirements, which internal documents (Engineering Instructions) apply, any
> Special Tooling Requirements, the specification to which the item is built
> (J-Std-001, NHB, etc etc), and any other cautions which the operator needs
> to know about.
>
> The fourth page (depending on the program) is reserved for a flowchart which
> indicates the operations that the item will be processed through.
>
> The subsequent pages have the instructions for how the item needs to be
> assembled. Each page is numbered and has a revision. The revision of the
> page is also indicated on the cover sheet. Each instruction has an
> operation number and a workcenter associated with it for timekeeping
> purposes. On "commercial" jobs, the operator merely signs off completion of
> the whole operation on a routing card which accompanies the unit. On
> "non-commercial jobs" there is a "Controlled" sign off sheet where the
> individual steps within the operation are signed off as they are completed
> then the operator also stamps off the routing card.
>
> At the end of the instruction pages, the current bill of material is
> provided.
>
> The remaining pages are reserved for data recording purposes such as part
> traceability, sign off sheets for step completion within the operation and
> inspection checklists.
>
> Unit testing information is provided on a separate document formatted in a
> similar fashion.
>
> Believe it or not we're still using good ol' Word Perfect 5.1. (OK, you can
> stop laughing now) The reason why we're still using it is primarily due to
> familiarity. Secondly, the old package handled graphics quite well. We have
> tried a number of conversions into various versions of Word and Word
> Perfect without much success.
>
> Questions...
>
> 1) If you have to have a document structure of a similar nature, what
> software package works well for you ?
> 2) Anybody out there make a conversion from Word Perfect 5.1 to another
> package ?
> 3) (Optional) What kind of work instructions do you give to shop floor folks
> ? (Do you throw 'em a print and say "go to it, good luck ?!?")
> 4) Any recommendations or observations?
>
> Any and all responses will be deeply appreciated.
>
> Bill Kasprzak
> Moog Inc.
>
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--
Have a Golden Day,
Paul Anderson
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http://www.amherst.com/
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