When talking to your peers, you can use whatever you like to get the idea
across.
But when you work on a standard, you have to consider the big picture,
and keep in mind the fact that you probably won't be able to revise it
again for many years to come.
Its quite restrictive at times...
Anyway, I quite enjoy noticing how different groups of people evolve their
language as they work closely together.
My teenagers do it constantly, and adapt almost day to day with stuff I've
never even heard anywhere else.
Its creative, and once the group knows what you mean it helps get a point
across quickly
(which is the whole point of communication, right?)
Sometimes you don't even notice that it is happening at all,
and then you are shocked when you go to another company and try to explain
something,
to discover that they are using a whole different set of words for similar
things.
For example, right now in this office there has been a lot of talk about
"via farms" in the last few days.
(to describe arrays of heat-sinking vias buried into power pads)
I don't think you will find that phrase in any standard (?)
have a wondrimentally fantabulous day,
Jack
.
On Tue, Mar 20, 2012 at 12:10 PM, Pete Waddell <[log in to unmask]>wrote:
> Actually Micron is a word, from the greek micros meaning "small" (Merriam
> Webster) - not very precise.
> I know Wikipedia is sometimes suspect, but the google search...
>
> Micrometre
> From Wikipedia, the free encyclopedia
> "Micron" redirects here. For other uses, see Micron (disambiguation).
> "Microscale" redirects here. For other uses, see Microscale
> (disambiguation).
> For the measuring instrument, see Micrometer.
> 1 micrometre =
> SI units
> 1.000×10−6 m 1.0000 μm
> US customary / Imperial units
> 3.281×10−6 ft 39.37×10−6 in
> A micrometre (or micrometer) is by definition 1×10−6 of a metre (SI
> Standard
> prefix "micro" = 10−6). In plain English, it means one-millionth of a metre
> (or one-thousandth of a millimetre, 0.001 mm, or about 0.000039 inches).
> Its
> unit symbol in the International System of Units (SI) is μm. The latter may
> be rendered as um if Greek fonts are not available or not admissible.
> "Micron" comes from Ancient Greek: μικρόν mikrón, which means "small".
>
> The term micron and the symbol μ, representing the micrometre, were
> officially accepted between 1879 and 1967, but officially revoked by the
> ISI
> in 1967.[1] In practice, "micron" is a widely used term in preference to
> "micrometre" in many English-speaking countries, and in American English
> the
> use of the term helps differentiate the unit from the micrometer, a
> measuring device, which would otherwise be spelled as a homonym with
> micrometre. The term "micron" has particular currency in science, and is
> extensively used in most English-speaking countries in the fields of
> geology, biology, physics, astronomy, machining, and the semiconductor
> industry.
> The micrometre is a common unit of measurement for wavelengths of infrared
> radiation.[2]
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Tom
> Hausherr
> Sent: Tuesday, March 20, 2012 12:33 PM
> To: [log in to unmask]
> Subject: Re: [DC] Updated "Designer's Day" Presentation
>
> Scott,
>
> Here we go again. Micron is not a word. You're going to hear from Jack
> Olson
> on this. In one of my magazine articles I used the term "Micron" and the
> editor and myself got blasted from the Metric Society.
>
> The word "meter" must appear in every metric measurement unit.
>
> The official term is Micrometer (Micron is American slang and not an
> official word or term). I know, some CAD Vendors use Micron Units, but they
> invented that term, not the International Standards committees.
>
> Micrometer
> Millimeter
> Centimeter
> Decimeter
> Meter
> Kilometer
>
>
> Note: In all my presentations, the #1 reason why PCB designers use Mil
> units
> is because there are no decimal points and it's vastly superior when
> entering numeric data in a CAD tool.
> Fact: Inserting metric component dimensions into a Footprint Calculator
> takes twice as long than using Mil units.
> Example: 0.025 mm = 1 mil what is faster to type (0.025 or 1)?
>
> So it's the decimal points in the metric system that are slowing designers
> down. The PCB design industry needs a Mil equivalent in Metric, but
> Micrometers is to granular for PCB layout. The PCB designer never needs to
> go past 0.01 mm for any PCB feature size. It would be great to have 0.01 =
> 1
> or 0.05 mm = 5 or 1.50 mm = 150 (anything to get away from having to use
> decimal points), but what would you call that unit?
>
> Tom
>
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Scott
> Riley
> Sent: Tuesday, March 20, 2012 8:42 AM
> To: [log in to unmask]
> Subject: Re: [DC] Updated "Designer's Day" Presentation
>
> Like most of you, I have to smile when following this thread. I have been
> in
> this business for a long time (I'm 50+), and deal with several OEM's and
> suppliers for both PCB's and flex circuits. Everyone I deal with has their
> own set of standards and terminology and I stopped trying to straighten it
> out many years ago. Too many arguments and it seems to go in circles.
>
> The latest designs we're doing are in "microns", the engineers speak in
> "mils" during the design review and the FAB drawing must be in "MM" for
> their corporate standards. Once you get used to it, it's not that bad.
>
> Regarding footprint vs. land pattern, same thing applies. We try to adapt
> to
> what the customer wants. We have an extensive "footprint library", unless
> you want me to send you a land pattern, then we have one of those as well.
>
> Pad vs. land is interesting. I had always been told that a pad had a PTH in
> it while a land does not.
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Tom
> Hausherr
> Sent: Tuesday, March 20, 2012 11:23 AM
> To: [log in to unmask]
> Subject: [DC] Updated "Designer's Day" Presentation
>
> All,
>
>
>
> Our web-server crashed so you'll have to wait until it comes back on-line.
> Nick Ban and our web team are hot on it.
>
>
>
> Thanks for the fantastic feedback and excellent dialog. In the IPC world,
> Jack Olson & Mike Buetow are correct that the term Footprint is the
> component package dimensional data and Land Pattern is what the Footprint
> solders to. The term "Land" is what the component lead attaches to.
> However,
> no one uses the term "Land" because all the CAD vendors call it a "Pad".
> It's what we deal with every day.
>
>
>
> At IPC APEX "Designer's Day" I made an announcement -
>
> "This is my last presentation... that I will ever give using Metric Only
> dimensional data in my Power Point files. From now on I will always include
> both Metric and Imperial dimensions side by side with Imperial being the
> dominant number and (metric) secondary until there is clear evidence that
> the industry has successfully transitioned. And I will always use the term
> Footprint when referring to PCB library parts because that is the term most
> widely used. And I will refer to Chip components using the EIA Imperial
> names of 1206, 0805, 0603, 0402 until the component manufacturer's refer to
> them using the IPC metric names 3216, 2012, 1608, 1005."
>
>
>
> Some of you reported typos in the Power Point Presentation. I updated the
> website last night -
> http://www.pcblibraries.com/Forum/ipc-apex-expo-2012_topic6.html
>
>
>
> The updates also affected the "Proportional Through-hole Padstacks" chart -
> Proportional_Through-hole_Padstacks.pdf
> <
> http://www.pcblibraries.com/Forum/uploads/1/Proportional_Through-hole_Padst
> acks.pdf> (you can still access this file on our server)
>
>
>
> People have been asking me off-line to explain the Proportional
> Through-hole
> Padstacks and I will post the explanation of the mathematical formulas here
> (once the server is back on-line) -
>
> http://www.PCBLibraries.com/forum/forum_posts.asp?TID=15
> <http://www.PCBLibraries.com/forum/forum_posts.asp?TID=15&PID=60#60>
> &PID=60#60
>
>
>
> One more thing, PCB Libraries, Inc. is 6 weeks away from launching the 5th
> generation IPC Calculator and after hearing your feedback we officially
> named it "PCB Footprint Calculator". This is brand new "coded from scratch"
> over the past 8 months and the Designer's Day Power Point Presentation is
> the blueprint for the new tool. Example: The user can insert the component
> dimensions in metric and then switch to mils and all the Footprint
> dimensions are converted to 1 mil increments, the Footprint & Padstack
> names
> are generated in Mil units. However, if you stay in metric units, the
> Footprint (Land Pattern) dimensions and library name will be in Metric
> Units. Example: you enter the component dimensions for a 3216 using metric
> dimensions and when you switch to Mils the Footprint name automatically
> changes to 1206 and all the Footprint dimensions are in 1 mil increments.
> The new tool boosts many new features including rotation to create the IPC,
> IEC or EIA Zero Component Orientation. Coming May 1, 2012 when the official
> PCB Libraries.com website opens. This is a Free download without any
> registration required, it will have regular updates that will have an
> auto-update notification and it will come with the Texas Instruments
> "Standard Parts" product line which includes over 35,000 TI part numbers.
> It's our gift to the electronics industry. No strings attached.
>
>
>
> 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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