That's true in this day and age. However, I would like to point out
the reasoning behind the "cause its always been done that way" argument:
In the past, MRP/ERP systems were limited as to how to handle tracking
of the various documents which relate to the assembly being done (and
some still are!). It is usually customary for the assembly drawing to
be the controlling document and when that drawing is pulled, the BOM
usually is the same revision unless there was some form of tabulation on
the assembly drawing to show the different revision of the related BOM.
But when one did that, and a a change was made to that BOM causing its
revision to change, that change had to be noted in the assembly drawing
and thus causing the assembly drawing to change its revision.
Therefore, to make things simple (and that's how it's always been), the
assembly drawing and the BOM tracks as one and the same. It doesn't not
take a whole lot of effort to change the revision letter on an assembly
drawing if just the parts list was changed! What are you trying to save
by having the BOM independent of the assembly drawing?
Hope this helps!
Regards,
Bill Gebhardt, C.I.D. +
PCB Design Engineer
General Atomics - Photonics Division
Advanced Wireless Group
(858) 457-8864 voice
(858) 457-8746 fax
[log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Bremer, Gary
Sent: Friday, October 07, 2005 9:50 AM
To: [log in to unmask]
Subject: Re: [DC] Assembly Documentation Question
This depends on how your MRP/ERP system has been implemented and the
philosophy of your Configuration Manager. As long as the supply chain
knows where to find the correct parts list for the assembly they are
assembling it does not matter.
Thanks,
Gary Bremer
Senior Manufacturing Engineer
Phone: 257-4430 extension 2170
-----Original Message-----
From: Michael Kuczynski [mailto:[log in to unmask]]
Sent: Friday, October 07, 2005 9:19 AM
To: [log in to unmask]
Subject: [DC] 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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