Micrometer 0.03556
Nanometer 35.56
-------------------------------------------------------- Message d'origine -----De : [log in to unmask] href="mailto:[log in to unmask]">paul reidÀ : [log in to unmask] href="mailto:[log in to unmask]">[log in to unmask]Envoyé : mardi, 3. juin 2003 23:10Objet : Re: [TN] (2) Micro-inch to copper weight conversion...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. 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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