stupid question:  What's the difference between mil and mm?

No stupid questions. But sometimes you might get an ignorant anwawer

"mil" is short for 1/1000 inch, or 0.001 inches. It is an English unit.

"mm" is mili-meter, or 0.001 meters. It is a metric unit. By convention,

most PCB measurements are done is "mils" and typical spacing is 100 mils,

or 0.1 inches. This is equal to 2.54 mm, 5.08 mm, or 10.16 mm spacing. This

is equivalent to 0.1, 0.2, and 0.4 inch spacing or 100, 200, and 400 mil

spacing

IC's typicall use a 100 mil spacing, or 0.1 inch, 2.54 mm.

David

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Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

No stupid questions. But sometimes you might get an ignorant anwawer

"mil" is short for 1/1000 inch, or 0.001 inches. It is an English unit.

"mm" is mili-meter, or 0.001 meters. It is a metric unit. By convention,

most PCB measurements are done is "mils" and typical spacing is 100 mils,

or 0.1 inches. This is equal to 2.54 mm, 5.08 mm, or 10.16 mm spacing. This

is equivalent to 0.1, 0.2, and 0.4 inch spacing or 100, 200, and 400 mil

spacing

IC's typicall use a 100 mil spacing, or 0.1 inch, 2.54 mm.

David

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On Fri, 14 May 2010, David Ingebretsen wrote to us saying :

"mil" is short for 1/1000 inch, or 0.001 inches. It is an English unit.

Actually it's a unit that the English generally call "thou" (for

thousandths of an inch), but since Eagle is not an English program the

more European "milli-inch" is used. I don't know what American

convention is.

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dingebre wrote on Fri, 14 May 2010 22:59

No stupid questions.

That's rediculous.  Of course there are stupid questions.  A stupid

question is one where the OP should have known better or been easily able

to find the answer in a obvious place.

This one is a good example.  I went to Google and entered "mil measure" and

the very first hit was http://www.thefreedictionary.com/mil, which is a

dictionary entry for "mil".  The first definition is "A unit of length

equal to one thousandth (10^-3) of an inch (0.0254 millimeter)".  Duh.

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Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Olin wrote on Sat, 15 May 2010 06:31

dingebre wrote on Fri, 14 May 2010 22:59

No stupid questions.

 

That's rediculous.  Of course there are stupid questions.  A stupid

question is one where the OP should have known better or been easily able

to find the answer in a obvious place.

 

This one is a good example.  I went to Google and entered "mil measure"

and the very first hit was http://www.thefreedictionary.com/mil, which is

a dictionary entry for "mil".  The first definition is "A unit of length

equal to one thousandth (10^-3) of an inch (0.0254 millimeter)".  Duh.

I see your point about using other resources. However, I will always defend

the cliche that, "the only stupid question is one that is not asked."

However, there are always abundant stupid and ignorant answers to any

question...

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Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.