Michael,

My experience and preference is to have the BOM and assembly drawing
match in revision.  If they don't match who is going to maintain a
matrix explaining what document goes with another document.

Does your BOM call out the revision of the assembly?  If so wouldn't you
have to uprev the BOM to reflect the change in revision of the assembly
print?

We experimented with making "dash" prints where we started with a
"generic" design with a -X suffix and then for subtle changes made -1,
-2, etc. assemblies but all based upon the -X print.  You wouldn't
believe the confusion this caused at outsource vendors and our
revisions.  Imaging the problem when the assembly print and BOM revs do
not match.

I... Can... Not... Change!    Must... Do... It... the...way... I...
Have... always... Done... It! 

Wow that was close.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael Kuczynski
Sent: Friday, October 07, 2005 12:19 PM
To: [log in to unmask]
Subject: [TN] Assembly Documentation Question

The company I work for is going thru some documentation change
discussions.
Below are the documents that are revisable. (The parts list contains all
the IC's, cap, res. etc. and documents.)
The feedback I'm getting is the the parts list and the assembly drawing
should ALWAYS be the same revision (becasue thats the way its always
been).
Everywhere I've every worked, these are independent documents.

Here are my scenerio case: (All documentation released at Rev. A)

Scenerio (Rev: B): A  part number change, of a 1K, 5%  resistor to a 1K,
1% resistor.
In this case, the part list and schematic would change, but it has no
effect on the assembly (because no part number or value is on the
assembly
drawing).

PL1234567-1             Rev:    B       Parts List
        AW1234567       Rev:    A       Assy Dwg
        DS1234567       Rev:    A       Drill Dwg
        PC1234567       Rev:    A       Artwork
        PA1234567       Rev:    B       Schematic

Scenerio (Rev: C): The length of the screw holding the stiffener bar is
changed from 3/8 in. to 1/2 in.
The change is to the parts list only, the assembly drawing stays the
same.
(no 3D view or side view)

PL1234567-1             Rev:    C       Parts List
        AW1234567       Rev:    A       Assy Dwg
        DS1234567       Rev:    A       Drill Dwg
        PC1234567       Rev:    A       Artwork
        PA1234567       Rev:    B       Schematic


The current discussion and question is;
-Can the parts list be independently revisible, from the assembly
drawing?
-What do most of the assembly houses usually like?


Thanks for any response to this question.

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