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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