I use IPC 325A.
Also remember that a fab drawing is a legal contract. It has higher
priority than the IPC standards they refer to. If the vendor does not
deliver what it say, they are obligated to refab the boards. If your fab
drawing is wrong and the vendor builds to it, then you have to pay up
and rework.
The fab drawing is IMPORTANT so pay attention to what you are saying.
You go, Bill!
Barbara Burcham, C.I.D.
Sr. PCB Designer
Fairfield, Ind., Inc.
[log in to unmask]
281-275-7687
281-275-7550 fax
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Tempea, Ioan
Sent: Tuesday, July 19, 2005 3:43 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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