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

unebonnevie

Hi,

 

I see a mix of mil and mm (millimeter) units?  Isn't mil also millimeter?

 

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

     

    "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.

     

  • in reply to Former Member

    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.

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of this | Windows NT crashed.

    message are purely   | I am the Blue Screen of Death.

    my opinion. Don't    | No one hears your screams.

    believe a word.      |

     

Reply
  • in reply to Former Member

    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.

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of this | Windows NT crashed.

    message are purely   | I am the Blue Screen of Death.

    my opinion. Don't    | No one hears your screams.

    believe a word.      |

     

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