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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