and perhaps function as well sadly...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Thursday, March 12, 2009 2:42 PM
To: [log in to unmask]
Subject: Re: [TN] Future SHALLs (IPC-2610)
So doesn't conversion to RoHS compliance warrant a part number change?
RoHs appears to change the "fit" category...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wolfe, Robert
Sent: Thursday, March 12, 2009 11:14 AM
To: [log in to unmask]
Subject: Re: [TN] Future SHALLs (IPC-2610)
See Comments next to statements
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Thursday, March 12, 2009 11:01 AM
To: [log in to unmask]
Subject: [TN] Future SHALLs (IPC-2610)
Last week I pointed your attention towards a set of "SHALL"s in the new
IPC-2610 series on Electronic Documentation
http://frontdoor.biz/PCBportal/ThouShaltDocument.pdf
Then, in a follow-up email "To Grid Or Not To Grid" several people
responded
to the requirements in 6.4.7 and 6.5 about documenting grids. To
summarize (I think this is a fair statement based on the contents of my
mailbox), many people provided good reasons for using grids DURING
DESIGN, but no one advocated DOCUMENTING the grid.
Now, in this email, I would just point out a few more shalls, give you a
chance to respond, and then I'm done. (I say I'm done because these
comments have to get back to the group before the committee meetings in
Las Vegas)
-=-=-=-
What Do You Think Of These Requirements?
The drawing revision description block shall identify the specific
changes made. It is not acceptable to just reference to the Engineering
Change Proposal
(ECP)
or other engineering document that initiated the change
##### I have not seen this done in almost 30+ years in the business, The
only place I have heard of it being done is Military. All commercial Co
I have worked for only state "Per ECN XXXXXXX" in Rev Block. ECN is
usually provided to vendors needing it.#######
The initial release of a design will be given a (-) revision. Subsequent
revisions will be assigned A,B,C,etc, leaving out I,O,Q,X,S,Z
######This really is up to the Company period, again it maybe a Military
issue to use only Letters for revs however if letters are used leaving
out I,O,Q,X,S,Z is good idea######
Whenever the drawing, or computer transferrable media, requires a
revision, the description shall identify whether the revision impacts
form, fit, function
### If form fit or function changes we always make it a new part
number#####
Three fiducials (or registration targets) shall be located on grid and
on each layer of data pattern. Each additional layer or data pattern
shall have fiducials located at the same points which, shall register
with each other, layer to layer.
###### No Comment ######
The method of excising individual boards shall be included in the
assembly pallet description
###### No Comment #############
Unplated through hole patterns, especially tooling and mounting holes
(board
mounting holes, interface connector mounting holes, board top
plate/mounting
bracket mounting holes, etc.) are generally drilled in separate drilling
operations as one of the last fabrication operations. They shall be
explicitly dimensioned and toleranced, even if they occur on grid.
####### Plated or not, if any feature requires a different tolerance
than in notes , it's Dimension and tolerance need to be in field of
drawing, if more than one tolerance range is specified in notes, there
would still be a need to identify in field of dwg which dimensions get
which tolerance so the dimensions would need to be there anyway.
########
The fabrication drawing shall specifically indicate the location for the
date code, fabricator's I.D. and UL marking, user's cage code, ESD
symbol and all other
required traceability markings
######it can't hurt to always specify a place rather than forget to if
your Design has any special Electrical Clearances required ##########
A note on the fabrication data set shall specify the acceptable bow and
twist requirements
#### Could just ref it per IPC Spec ###
-=-=-=-
Anyone who writes back can say they helped a standards development
committee! See how easy this stuff is?
If you are lucky enough to attend APEX/EXPO, wander into a real meeting.
Here are the choices: http://www.ipcapexexpo.org/Std.aspx
Jack (aka "the new guy")
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
DISCLAIMER:
Important Notice *************************************************
This e-mail may contain information that is confidential, privileged or
otherwise protected from disclosure. If you are not an intended
recipient of this e-mail, do not duplicate or redistribute it by any
means. Please delete it and any attachments and notify the sender that
you have received it in error. Unintended recipients are prohibited from
taking action on the basis of information in this e-mail.E-mail messages
may contain computer viruses or other defects, may not be accurately
replicated on other systems, or may be intercepted, deleted or
interfered with without the knowledge of the sender or the intended
recipient. If you are not comfortable with the risks associated with
e-mail messages, you may decide not to use e-mail to communicate with
IPC. IPC reserves the right, to the extent and under circumstances
permitted by applicable law, to retain, monitor and intercept e-mail
messages to and from its systems.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please
visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
========================================================================
======
This email and any attachments thereto may contain private,
confidential, and privileged material for the sole use of the intended
recipient. Any review, copying, or distribution of this email (or any
attachments thereto) by others is strictly prohibited. If you are not
the intended recipient, please contact
[log in to unmask]
immediately and permanently delete the original and any copies of this
email and any attachments thereto.
========================================================================
======
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 Please
visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
