One of the differences working for an OEM vs CEM is the ability to
match design and process. If I am using antique printers with some
known idiosycracies, I can put this into the stencel design. Good luck
to the CEM who got this later unless they started with the 1:1.
It is uncomfortable to have suppliers globally sourced, Open Standards
have made this possible.  It is best to have the CEM responible for
the details of the production process. Otherwise it is back to the old
Mil Std of how you do it rather than what it has to end up as. If you
give expilcit intructions that do not work, you will end up buying
some unexpected bad assemblies.
Fortunetly there are organizations like IPC and JEDEC working on
standardization over the industry. The days of strong, deeply talanted
companies with a wide variety compentancies providing guidance are
gone. Philips is nothing like it was in the 90's. GE provided the
drafting standards at that time and Martin Marieeta was the electronic
assembly standard. I much prefer the IPC610.

On 12/15/11, Pete <[log in to unmask]> wrote:
> Being a control freak designer, I much agree with Richard's philosophy.  I
> would very much prefer to have a CAD library full of proper stencil
> apertures that I created with input from process engineering.  (We even have
> a completely separate database layer just for this - no using the top layer)
>
> Unfortunately, we have boards assembled in the US, in China, Carribean,
> Europe - the CMs change, I couldn't even come up with names of process
> engineers at half of our facilities.  And supply chain has the freedom to
> move production around.
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 16.0
> 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
> For additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-615-7100 ext.2815
> -----------------------------------------------------
>

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
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
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------