IPC 275 used to have a Master drawing requirements chart that might help. It is not in 2221, but is in IPC-D-325 and 2614 from what I've been told by Gary.
Good luck! Are you going to give your presentation at a conference??? Hope to see it!
Susy
>
> From: "Brooks,Bill" <[log in to unmask]>
> Date: 2005/07/19 Tue PM 03:57:53 CDT
> To: [log in to unmask]
> Subject: Re: [DC] Reading Fab Drawings
>
> Great points!
> It will be available for download... And I think creation of the Fab drawing
> goes hand in hand with reading and interpreting them...
> We can explore the topic from both angles...
> I have an old set of 'standard notes' used from the past... they are online
> on one of my website pages at pcbwizards.com
>
> There are probably other places too...
> I remember Tom Hausherr used to share his standard notes with anyone that
> would ask...
>
> I really want to try to go at this methodically and break it down into
> logical steps...
> What to define first, second and so on...
> Ideas?
>
> Bill Brooks
>
> -----Original Message-----
> From: Tempea, Ioan [mailto:[log in to unmask]]
> Sent: Tuesday, July 19, 2005 1:43 PM
> To: [log in to unmask]
> Subject: Re: [DC] Reading Fab Drawings
>
> Bill,
>
> I think it is a great initiative and hope it will be available for download
> somewhere ;o)
>
> I think a tougher job would be though writing a presentation on how to write
> fab drawings. I don't know if this is covered in the CID classes, but I
> surely know that 90% of the fab drawings that I see are either meaningless,
> or have exagerated requirements. Not to mention that at least 25% of the
> PCBs that I check have no fab drawings!
>
> Any clues on where to find guidelines on writing tech notes for PCBs?
>
> Regards,
> Ioan
>
> > -----Original Message-----
> > From: DesignerCouncil [SMTP:[log in to unmask]] On Behalf Of
> Brooks,Bill
> > Sent: Tuesday, July 19, 2005 4:27 PM
> > To: [log in to unmask]
> > Subject: [DC] Reading Fab Drawings
> >
> > Thanks... it's reassuring to see there are some folks out there...:) not
> > everyone is away on holiday are they???
> >
> > I hope your summer is going great... We have been very, very busy and I
> > figure that's the same for most of you...
> >
> > I'm planning on putting together a little presentation on 'Reading Fab
> > Drawings' over the next week or so. It's a good subject, pondered by many
> > folks who have had to interpret the drawings we send them to build our
> > boards from... I'm sure we could all benefit from the use of better
> > communications...
> >
> > I have had on occasion received boards that came in that were mostly
> > 'artistic renditions' of what was really asked for... by that I mean
> somehow
> > the cam operator on the other end interpreted the drawing to allow break
> > away tie points in the assembly panel that weren't in the drawing or
> removed
> > others that were needed to support the board in the panel and were drawn
> on
> > the drawing... We have to indicate the location of any break away tie
> points
> > exactly in order to avoid problems with traces or parts sitting too close
> to
> > the break away point and over stressing them during Singulation or
> > de-panelization.
> >
> > Board materials sometimes don't meet spec, copper and board thickness can
> > vary widely with too general or non-specific notes. I sometimes wonder if
> > the 'language' used in the notes doesn't drive this or if they even read
> the
> > drawings at all... After you get to know the folks in your receiving
> > inspection department you will undoubtedly see some of these sort of
> > variations, especially when you switch vendors... Oh boy! Watch those
> first
> > batches of boards that come in closely...
> >
> > At any rate, any pointers, experiences, or stories you all have for the
> > short presentation are most appreciated... I'll be happy to draw on your
> > experiences in creating it...
> >
> >
> > Of course, have a terrific summer... it goes by very quickly!
> >
> > Best regards,
> >
> >
> > Bill Brooks - KG6VVP
> > PCB Design Engineer, C.I.D.+, C.I.I.
> > Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
> > Datron World Communications, Inc.
> > _______________________________________
> > San Diego Chapter of the IPC Designers Council
> > Communications Officer, Web Manager
> > http://dcchapters.ipc.org/SanDiego/
> > http://pcbwizards.com
> >
> > -----Original Message-----
> > From: Brionez, Gregory [mailto:[log in to unmask]]
> > Sent: Tuesday, July 19, 2005 11:55 AM
> > To: (Designers Council Forum); Brooks,Bill
> > Subject: RE: [DC] test -
> >
> > Were here! Were here!
> >
> >
> >
> >
> >
> >
> > Paul Brionez - CID <mailto:[log in to unmask]>
> > [log in to unmask] <mailto:[log in to unmask]>
> > PCB Designer
> > PH: 847-673-2718 x1394
> > FAX: 847-673-9789
> > DIVISION: Electronic/Systems
> >
> > MPC Products Corporation
> > <http://www.mpcproducts.com/> ISO 9001 Certified
> > Skokie, IL USA
> >
> > <http://www.mpcproducts.com/>
> >
> >
> > *
> >
> >
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