James,
Good catch on Sheet 27 the Square Padstack Names are wrong. They should be
exactly the same as the the Circular Padstack Names only the "c" changes to
an "s". I fixed that typo and I'll upload a new version of the presentation
tonight. Thanks for finding that typo. Actually, it was an Excel spreadsheet
formula issue. I copied the formula from one cell to the next and it bumped
all column data in the formula. Normally I like our software programmers
update the master Excel Spreadsheets, but I take the blame for this one.
The master Proportional Padstack Charts are here, but they have the typo
mistake too. But I will upload the fixed version tonight.
http://www.pcblibraries.com/forum/proportional-throughhole-padstacks_topic15
.html
Sheet 28 - Yep, I forgot to add the thermal spoke dimension. I'll fix that
too.
The Padstack Naming Convention is right out of the IPC-7351B standard.
However, most people I talk to have developed their own padstack naming
convention a long time ago. But if you have some good ideas about padstack
names, please share them with us. There's nothing better than a good
challege to the existing standards.
Tom
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, March 19, 2012 12:09 PM
To: (Designers Council Forum); Tom Hausherr
Subject: Re: [DC] IPC APEX Designer's Day
Tom,
Thanks for posting that link. Your efforts in this area are appreciated.
Briefly looking over the document, are the numbers correct on sheet 27?
(Padstack Name Square Land column)
Also, on sheet 28, I do not see a Spoke width callout for the large pad. Was
that on purpose?
I have a few other thoughts that I will keep to myself - some dealing with
the recommended padstack naming conventions that you are proposing.
Regards,
James Jackson
Oztronics
Quoting Tom Hausherr <[log in to unmask]>:
> Hi Everyone,
>
>
>
> I posted my IPC APEX "Designers Day" Power Point presentation on "PCB
> Design Optimization Starts in the CAD Library" here -
> http://www.pcblibraries.com/Forum/ipc-apex-expo-2012_topic6.html
>
>
>
> This presentation contains recommendations for adding PCB library
> drafting elements such as Silkscreen and Assembly Outlines, Polarity
> marking, Reference Designator sizes, Local Fiducials, round-off
> resolution update and the implementation of Mil Units for the upcoming
> IPC-7351C standard.
>
>
>
> One note on the Mil Unit subject. As PCB Designers, we have been
> taught DFM (Design For Manufacturing) rules during our entire career.
> For the past 10 years I have been all over the world promoting PCB
> Designers to transition to the metric measurement system and revealing
> why the metric system is superior for PCB design layout. However, our
> PCB fabrication shops prefer Mil unit Gerber or ODB++ data, drill
> data, fabrication drawings and layer stack-ups, panel sizes, material
> thicknesses, etc. The global electronics industry including component
> manufacturer's, CAD vendors, fabrication, assembly, mechanical and PCB
> design is split down the middle on this subject. I believe it will
> remain this way until the PCB fabrication process completely
> transitions to metric.
>
>
>
> I've been on the open market contracting PCB layout for DOD companies
> and they're ALL doing mil unit PCB design. Most PCB design service
> bureaus are doing mil (inch) based PCB layout because that's what
> their customers are asking for. I've submitted employment resumes to
> firms all over the USA to seek employment and the vast majority of
> them are doing mil unit PCB layout.
> At this year's IPC APEX conference there was a large crowd at the
> Designer's Day event and when I asked the question "How many of you
> are doing metric PCB layout?" only a couple people raised their hand.
> When I asked "How many of you are doing PCB layout in mil units?" the
> vast majority of the attendees raised their hands. When I asked people
> why they still do PCB layout in mil units the majority say "because
> our fabrication shops prefer mil units and we are big on Design For
> Manufacturing (DFM)".
>
>
>
> Most people in our industry refer to chip capacitors and resistors
> after their inch based names 1206, 0805, 0603, 0402 and not the IPC
> metric names 3216, 2012, 1608, 1005. All CAD vendors create their
> default software installation in mil or inch units (not metric).
> Popular PCB fabrication shops default to mil unit presentations in
> their private seminars to their customers or at IPC symposiums. Are we
> being brainwashed or are we in a state of chaos?
>
>
>
> I applaud IPC, JEDEC, NIST and the component manufacturing industry
> for fully transitioning to the metric unit system, but I fear that
> things are more messed up than ever before in our industry. Being
> split into two measurement systems is not exactly optimizing the
> electronics industry. So I propose that IPC go back and add mil
> dimensions in all of their standards to eliminate the confusion in
> dealing with dual measurement systems. IPC needs to recognize that a
> vast majority of the PCB industry is not transitioning to the metric
> unit system and that we need standards that are applicable to our
> profession today. Download my Power Point presentation from
> "Designer's Day" and you'll get a good taste of the metric / mil state
> of the PCB library industry.
>
>
>
> That's my opinion, what's yours?
>
>
>
> Best Regards,
>
> Tom
>
>
>
> Tom Hausherr
>
> President
>
> PCB Libraries, Inc.
>
> 13730 Sorbonne Court
>
> San Diego, CA 92128
>
> 858.592.4826 Office
>
> 858.859.5371 Cell
>
> [log in to unmask]
>
>
>
>
>
>
>
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