If you change the form, fit, or function --
you must change the part number.
If you a change the face of the drawing or artwork
and that change does not affect
the form, fit or function in any way; (backward compatible)
you must increment the revision of that drawing or artwork.
The artwork and the fab drawing
should always be the same part number and revision level;
this eliminates many questions and confusion that increase the overall costs
! ! !
Follow the money.
Pay me now or pay me latter.
Some of this may not seem necessary --
it is cheaper to keep it clean from the beginning period
M Keel
San Diego
--Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of KK Chin
Sent: Wednesday, April 07, 1999 8:46 PM
To: [log in to unmask]
Subject: Re: [TN] Part number systems
Dennis,
We change the board part number (or dash number) only when the new change is
not
backward compatible. The parent assembly BOM will of course need to reflect
the
new board #. You don't have to do that if your MRP/ERP system treats
different
rev as different part numbers.
Even if a change doesn't affect the artwork, it's hard to agree internally
whether it has impact on form, fit, function. An example is to change the
PCB
laminate material.
Regards
K.K. Chin
Artesyn Technologies
Fremont, CA
http:\\www.artesyn.com
Dennis Ward <[log in to unmask]> on 04/07/99 10:47:36 AM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
to
Dennis Ward <[log in to unmask]>
To: [log in to unmask]
cc: (bcc: KK Chin)
Subject: [TN] Part number systems
Hello,
I was wondering if someone could help me with some finer points
of documentation?
Right now we have a system where we try to distinguish between
form, fit, function changes versus a "documnetation change".
Example: board number XX-XXXXX-01 rev:A. The board number
is the same number as the fabrication drawing number.
Above board is fabricated, but when it comes back in house
we notice that we need to add more functionality. Thus new
artwork is needed so the board number goes from
XX-XXXXX-01 Rev:A to XX-XXXXX-02 Rev:A
Now the new board is at the board fabricators and they
notice an error on the fabrication drawing. Since this
correction will not change the artwork, only the drawing
the new number is changed to XX-XXXXX-02 Rev:B in-
dicating a NON-form, fit or function change.
Sooooo........
1) Does this make sense?
2) How do you people handle part numbers and rev changes??
Do any of you try to distinguish between form, fit, function
versus non-form, fit, function.
3) When your raw board changes does this have a "domino"
effect and change every BOM up the ladder?
Hope this scenario makes sense, sorry if it doesn't.
Regards
Dennis
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