[log in to unmask] wrote:
>
> Hello,
> I'm starting an engineering support department in a new company and
> I'm looking for some suggestions on creating a part numbering system.
> It's a new telecommunications company which will eventually be ISO and
> BSA certified.
> I'll need part numbers for components, hardware, and drawing numbers.
> -Are there any standards that I should reference?
> -Any workmanship specifications that I could use as a guideline?
> -Some idea's on the amount of characters and category listings to use?
>
> Thanks,
>
> Raymond Smith Jr.
> Sr.PC Board Designer
> (short time address)
> ADC Broadband Communications
> 999 Research Pky.
> Meriden, Ct. 06450
>
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Hi Ray--
At my previous employer, they had a real nice and user-friendly document
numbering system. The following is a brief description:
General format: abc-yy-123456-de
The abc field was used as an identified for different engineering
groups: AAA was used by mechanical engineering; PEL was used by plant
engineering; LEA, LED, LEN, LEP, LER, and LES were used by electronics
engineering where LEA was used for most electrical/electronic
assemblies/equipment, LED was used to establish internal design
requirements/limits for "standard" stores stocked/inventoried commercial
components, LEN was used for "informal" engineering notes, LEP was used
for procedures, LER was used for reports, and LES was used for
specifications in order to obtain custom items generally in the form of
a "performance fabrication".
The "yy" was the last digits of the year.
The 123456 field is a unique drawing number and was handled differently
for each engineering department.
Mechanical Engineering used the entire 6-digit field sequentially, many
mechanical designers didn't like their system and would have preferred
to use Electronics Engineering's.
Plant Engineering divided the numeric field into a 123-456 or 1234-56,
where the 123 sequence of numbers was the (permanent) building number on
the site plan and the 456 were sub-drawings for that facility. The
4-digit format was used for temporary/trailer facilities, followed
2-digits of sub-drawings.
IMO, Electronics Engineering had the most user friendly system, is was
easy to identify the type of document from the first sequence of
letters. The general formats were LEA-97-1234-56-OS, or
LEA-97-123-456-OE and an explanation follows:
The 6-digit field was use in two methods. One way was
4-digits - 2-digits. The 1000, 2000, 3000, etc series of numbers were
issued by programmatic division/projects for each functional product
(could be a printed board assembly, a module, chassis or small system).
The 9000 series was reserved for electrical/electronic
equipment/assemblies that were designed in-house, manufactured in-house
or on subcontract, and were stocked in the on-site stores. The 2-digit
field was generally used as follows:
the 01 was reserved as the overall schematic/block diagram for the
product, the 11, 21, 31, 41, etc numbers were used for the schematic for
a subassembly/module. The 02 was the overall D&I (design and
information) on the overall product, the 12, 22, 32, etc were used as
D&I's for each sub-product. The 03 was the overall parts list, the 13,
23, 33, 43, etc were the sub-products parts lists. The 04, 14, 24, 34,
etc were similarily used for the printed board master drawings. The
remaining numbers were used for other documentation requirements
Electronics sometimes used a 3-digit - 3-digit format. The first
3-digits were limited to the series of 001 through 099, and the second
3-digits ranged from 001-999. These were used for more complex systems
where up to 999 drawings/documents were required for the system.
The reason mechanical designers liked electronics engineering was
because of it's modularity, you just about knew all the drawings for an
assembly were in a particular series of numbers.
The last fields "de" were used as follows: "d" was used it identify the
revision level (letter the default was (O) "original", then A, B, etc) (the
thought was the if you needed more than 25 revisions, you'd better
consider a re-design and issue a new number). The "e" field was use to
identify the "type of drawing" a "S" was used for a schematic, "P" for a
parts list, "E" for "etching" film for master drawings, "F" form
fabricated parts (like sheet metal), etc.
It was a very simple system for human use and provided a lot of
versatility.
Ralph
--
Ralph Hersey
Ralph Hersey & Associates
3885 Mills Way
Livermore, CA 94550-3319
PHN: 510.454.9805
FAX: 510.454.9805
e-mail: [log in to unmask]
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To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
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