On 5/15/2010 12:06 PM, David Ingebretsen wrote:
Hi James,
>
Coming from an education in mechanical engineering and physics, the terms
"mil" and "thou" are completely unambigous and equivalent. That said, I
think in the world of PCB layout, "mil", "thou", and "mm" do get confusing,
especially to one with little or no machining background or mechancial
engineering studies.
>
Form my experience, "thou" is more arcane and "mil" is more commonly used.
Either works.
A curse on whoever set up English units!
>
David
>
I think we are missing the real point here. When is the world going to
finally go metric and completely drop the imperial system "FOREVER".
Then the use of "Mil" will become more obvious. Lets face it; doing PCB
layouts with both metric & imperial components can be a pain. How many
Mars probes do we have to loose. How many 100 MPH speeding tickets are
we going to get. The metric system is clear, (based on 10) and can be
checked back to a couple of standards. I believe the imperial system,
based on the inch, was the width of a kings thumb pressed up against
glass. And by "King" I don't mean Elvis or the Burger King guy.
John
On 5/15/2010 12:06 PM, David Ingebretsen wrote:
Hi James,
>
Coming from an education in mechanical engineering and physics, the terms
"mil" and "thou" are completely unambigous and equivalent. That said, I
think in the world of PCB layout, "mil", "thou", and "mm" do get confusing,
especially to one with little or no machining background or mechancial
engineering studies.
>
Form my experience, "thou" is more arcane and "mil" is more commonly used.
Either works.
A curse on whoever set up English units!
>
David
>
I think we are missing the real point here. When is the world going to
finally go metric and completely drop the imperial system "FOREVER".
Then the use of "Mil" will become more obvious. Lets face it; doing PCB
layouts with both metric & imperial components can be a pain. How many
Mars probes do we have to loose. How many 100 MPH speeding tickets are
we going to get. The metric system is clear, (based on 10) and can be
checked back to a couple of standards. I believe the imperial system,
based on the inch, was the width of a kings thumb pressed up against
glass. And by "King" I don't mean Elvis or the Burger King guy.
John
