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. 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