TECHNET Archives

May 2012

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Fri, 11 May 2012 14:50:50 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (63 lines)
Doug,

This was originally my comment. There are several scenarios as noted in the following:

*         Printed boards as individual pallets within the manufacturing panel will have pre-routes defined to facilitate removal of the final printed board assembly. These are usually where connectors over-hang or tall components near the edge that would hinder the router on final route out. There could also be internal routing defined. If this is done as an in-process step and followed by final test and a final cleanliness requirement, then there is less of a concern.

*         Same as above, except this is done as a post-process step. Handling, the routing process itself and/or assembly could contaminate the printed board.

*         Same as above but done at a sub-tier assembly house. This may include the punching, biting, screaming (sorry, wrong story line), scoring or a true engineered pre-route. Concerns are same as above only more-so due to potential unknown or lack there-of critical processing steps. The packaging and re-packaging are added concerns.

*         If the final delivered entity is the single printed board image that had pre-routes and a post-route and there are requirements for a final test, final clean, SIR data, IC data or equivalent; then never mind.



Dewey



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, May 10, 2012 9:20 AM
To: [log in to unmask]
Subject: [TN] IPC-5703 Question 2



OK, next question.



In our draft outline, one of the commenters (don't know who) indicated

"pre-routing operations" as a potential source of contamination, either

chemical or particulate.



We are not really sure what "pre-routing operations" are.  What would you

say that refers to and would that step be a contamination source?



Doug Pauls





______________________________________________________________________

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]

______________________________________________________________________

______________________________________________________________________
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] 
______________________________________________________________________

ATOM RSS1 RSS2