Paul
It's 0.035 millimeters, 35 micrometers and 35,000 nanometers etc!
Just shows that software is fallible.
You missed out the ell! :-)
Brian
paul reid wrote:
> There is a range in the thickness measurements of 1-ounce copper and
> .0014? is on the high side. Often the actual copper measurements are
> lower. In fact I rarely measure .0014? for 1 ounce copper foil. If the
> foil measurement is between .0012? - .0014? I conclude that it is
> 1-ounce copper.
>
> For those who pay attention to such things, here are the thicknesses of
> 1-ounce (0.0014?) copper in most measurements of length.
>
> Angstrom 355.6
>
> Arpent 6.07638889 E-10
>
> Astronomical unit 2.377005348 E-19
>
> Centimeter 3.556 E ?6
>
> Chain 1.767676768 E-9
>
> Cubit (Biblical) 7.777777778 E-8
>
> Decimeter 3.556 E-7
>
> Decameter 3.556 E-9
>
> Fathom 1.944444444 E-8
>
> Fermi 35560000
>
> Fingerbreadth (Biblical) 1.866666667 E-6
>
> Foot 1.166666677 E-7
>
> Furlong 1.767676768 E-10
>
> Hand 3.5 E-7
>
> Handbreadth (Biblical) 4.666666667 E-7
>
> Hectometer 3.556 E-10
>
> Inch 1.4 E-6
>
> Kilometer 3.556 E-11
>
> Kilosparsec 1.152401813 E-27
>
> League 7.365319865 E-12
>
> Light Year 3.758775248 E-24
>
> Link 1.767676768 E-24
>
> Long Foot (Biblical) 6.666666667 E-8
>
> Long Reed (Biblical) 1.111111111 E-8
>
> Megaparsec 1.152401813 E-30
>
> Meter 3.556 E-8
>
> Micrometer 0.03556
>
> Mils 0.0014
>
> Mile 2.2095959596 E-11
>
> Millimeter 3.556 E-5
>
> Nanometer 35.56
>
> Nautical Mile 1.920086393 E-11
>
> Parsec 1.152401813 E-24
>
> Perch 7.070707071 E-9
>
> Pica 8.4 E-6
>
> Planck 2.2225 E-27
>
> Point .0001008
>
> Pole 7.07070707071 E-9
>
> Reed (Biblical) 1.296296296 E-8
>
> Rod 7.070707071 E-9
>
> Span (Biblical) 1.555555556 E-7
>
> Twip 0.0002016
>
> Yard 3.888888889 E-8
>
>
>
> A very good share ware program, Master Converter, is available at
> www.savardsoftware.com <http://www.savardsoftware.com/>. A nice feature
> of this program is that you can add your own conversions. I, for
> example, added a copper ounces per square foot to nominal thickness
> conversion.
>
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Mcmaster, Michael [mailto:[log in to unmask]]
> Sent: Tuesday, June 03, 2003 12:40 PM
> To: [log in to unmask]
> Subject: Re: [TN] (2) Micro-inch to copper weight conversion...
>
> Sorry, Mike I have to disagree with you on this. It would be very
> uncommon to see 1 oz copper at 1.3 mils in a finished board.
>
> Almost everyone uses foil that is at the thin end of the spec.
> Why? Because copper is sold by weight and thinner foil weighs and
> costs less. IPC 4562 says that ED foils can be 10% below the listed
> nominal (nominal for 1 oz is 34.3 um or 1.35 mils). Foil more
> commonly comes in at 1.30 mils or less. Processing does reduce this
> down to 1.2 or thinner. Remember on the finished board, the copper
> thickness only needs to be 1.0 mils.
>
> Mike McMaster
> RF Product Engineer
> Merix Corporation
> 503-992-4263
>
>
>
> ----------
> From: Barmuta, Mike[SMTP:[log in to unmask]]
> Reply To: TechNet E-Mail Forum.;Barmuta, Mike
> Sent: Tuesday, June 03, 2003 7:19 AM
> To: [log in to unmask]
> Subject: Re: [TN] (2) Micro-inch to copper weight
> conversion...
>
> Robert: Fascinating story about ivory PCB's, never heard that
> one before.
>
> I think there needs to be some clarification on the thickness
> of 1oz Cu
> foil. It may start out at 1.4 mils but it ends up at about 1.3
> mils due to
> processing steps such as deburring and microetch. So in the
> real world, the
> boards Steve was questioning that were fabricated using 1oz
> foil should have
> a FINISHED Cu foil thickness of 1.3 mils after conventional
> processing.
>
>
> Regards
>
> Michael Barmuta
>
> Staff Engineer
>
> Fluke Corp.
>
> Everett Wa
>
> 425-446-6076
>
>
>
> -----Original Message-----
> From: Robert Tarzwell [mailto:[log in to unmask]]
> Sent: Monday, June 02, 2003 4:37 PM
> To: [log in to unmask]
> Subject: Re: [TN] Micro-inch to copper weight conversion...
>
>
> This just goes to show how old I am but when we first started
> to manufacture
> printed circuit boards the only copper you could buy was a
> very thin sheet
> the roofers used to solder flashes around wondows and stuff it
> was 2 oz
> copper and thats how it was sold by the oz. then the lamianted
> manufatures
> started to make laminate I think GE was first, or thats who we
> got, So even
> though theres lots of replies it all started with the
> available copper of
> the day. early 1960's
> Not realy connected but my grandfather told me about making a
> sort of
> printed board in the 20's by using IVORY and drawing lines
> between copper
> rivets with carbon black in wavy lines to make resistors.
> Robert tarzwell
> PS some replies have the thickness of 1 oz of copper incorect
> it is closer
> to 1.39 mils. not 1.3
>
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