And in my opinion, the circuit designer is the "master". He knows what the
circuit is supposed to do and how it is supposed to work and he should be
able to recognize when it will not work. (e.g. what parts of the circuit are
very sensitive and should not be near other parts of the circuit; which
parts of the circuit have very large signals on them; which parts of the
circuit use very large currents; which parts of the circuit use very high
voltages, which parts of the circuit use very high frequency signals and
need controlled impedance lines, which parts of a digital circuit form a bus
and all signals need to arrive at very close to the same time, etc.)
Together with the board designer the circuit designer should discuss all
these potential problems and together conclude how the board gets laid out.
Of course the mechanical design engineer gets involved to determine how the
board fits in the intended enclosure and where the mounting points need to
be. And the manufacturing engineer from the board manufacturer needs to be
involved to make sure that the board fits optimally in their board
manufacturing process and the manufacturing engineer from the assembly plant
has to do the same thing for their processes and -------.
Did I forget anyone? Oh yeah, don't forget to talk to the safety engineer to
make sure he agrees with all the board spacings from a regulatory stand
point.
Of course the assumption has been that all these functions are handled by
different people. When several of these functions are included in one
person's job, all this cooperation can be easier to accomplish (but also
easier to get overlooked.)
In short, somebody, anybody, a Project Engineer, has to do all this
coordination to make sure everyone's requirements get included. Is that what
is called DFM?
Have fun,
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of LINO REBOREDO
Sent: Wednesday, January 15, 2003 16:38
To: [log in to unmask]
Subject: Re: [TN] Stencils
Hi, in my opinion if we are speaking about DFM, DFA, DFT, in general the
designer of the PCB have to understand what he is doing and how will be
manufactured up to the final product, what he is designing. The board
designer is the "master for the process".
Our exp. in this point is to concentrate all efforts and manufac. experience
on the board designer... takes efforts and costs, but at the end the result
is positive.
hope to help
regards
lino
>From: Donald Kyle <[log in to unmask]>
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>, Donald
>Kyle <[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Stencils
>Date: Tue, 14 Jan 2003 08:33:16 -0600
>
>I would like your opinion on who would be more suited to
>design stencils for SMT PWBs; the board designer or the
>contract-manufacturing engineer.
>
>What do you do and why?
>
>
>
>Donald Kyle C.I.D.+
>281-285-7528
>
>---------------------------------------------------
>Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
>To unsubscribe, send a message to [log in to unmask] with following text in
>the BODY (NOT the subject field): SIGNOFF Technet
>To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at: http://listserv.ipc.org/archives
>Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
>information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
>ext.5315
>-----------------------------------------------------
Hi
_________________________________________________________________
MSN Fotos: la forma más fácil de compartir e imprimir fotos.
http://photos.msn.es/support/worldwide.aspx
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
