Khaled,
There will be many responses to this request, and they will all be
different. I will just explain how we do our numbering system.
We assign a number to our boards which corresponds to the
drill drawing number. In our case, that is a 3 digit number which
designates it as a drill drawing, then 4 digits which identifies that
particular board. As an example, 555-1234. The 555 is reserved
for board drill drawings and 1234 is one particular board.
We include this number on each artwork layer, but then we
assign each layer a number and revision letter. IPC
recommends starting with the component side as layer 1, the
next layer as layer 2 and so on until you reach the solder side. In
the case of an eight layer board you would have the numbers 1
through 8 for all the layers. So for my example you would have
the number 555-1234-1/A. The -1/A is the layer number (1) and
the revision number of that artwork layer (A).
Effectively, I can control every artwork layer of the board
individually since I include the artwork revision on my drill
drawing in a chart. My drill drawing will have a chart of some
form which would include this information for each layer.
555-1234-1/A (layer 1, revision A)
555-1234-2/A (layer 1, revision A)
555-1234-3/B (layer 1, revision B)
555-1234-4/B (layer 1, revision B)
555-1234-5/C (layer 1, revision C)
555-1234-6/A (layer 1, revision A)
555-1234-7/D (layer 1, revision D)
555-1234-8/A (layer 1, revision A)
I can also use this form to include the solder mask and/or solder
paste artworks, such as -1SM for layer 1 solder mask.
The quantity of numbers is something you cand determine on
your own, whether it is 2 digits or 12. But the basic number does
come in handy if you want to easily locate which artworks go with
a particular board.
I hope this has helped somewhat and not been too confusing.
Good luck.
Larry Campbell
Supervisor, PWB
BFGoodrich, Avionics Systems
>>> Khaled Hassan Fouad <[log in to unmask]> 05/25/98
04:19am >>>
Dear Designers,
We are a company that deals with consumer electonics,mainly
in TV's and
VCR's,we are now designing our own products and as a design
team we want
to generate the part number for the PCB (mainboard,cpt,etc.) ,so
we want
a termenology to use,so that the board to be descriptive to our
design
team only and not by others,we want also to identify the different
PCB
layers and give them a sort of numbering.So that it can be
retrieved
later ( I've seen a company that gives each layer a number that is
printed on the board). This part number should not exeed 12
characters.
Do you have any ideas?
--
Khaled H. Fouad
PCB Design Engineer, R&D Department
PCB Egypt , Member of BAHGAT Group Foundation
http://www.bahgat.com
Email : [log in to unmask]
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