Re: [SI-LIST] : Recommendations for High Density PCB to PCB Connection

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From: Laurence Michaels (lmichael@techmail.gdc.com)
Date: Thu Nov 04 1999 - 10:13:55 PST


Mike Ventham wrote:
>
> Laurence,
>
> I still think you are having calculation problems.
> Your answer was correct but
>
> 1 sq inch = 1000 mils * 1000 mils = 1000000 sq mil. NOT 10000 sq mil
>
> >From this
> 1 sq inch = 25.4 mm * 25.4mm = 645.16 sq mm
> 0.0025 sq inch = 1.61 sq mm. which matches your answer.
>
> Laurence Michaels wrote:
> >
> ( deleted)
> > Argh... I was asleep when I did that calculation. Time to check
> > everything else I did yesterday :-)
> >
> > 0.2*0.5=0.1 square inch.
> > 0.1/40=0.0025 square inches per connection
> >
> > (calculation error was probably here... 0.0025 square inches does
> > NOT equal 2.5 square mils... that's what I get for using non-metric
> > units, and only turning on half of my conversion algorithms.
> > 1 sq in = 10000 sq mil 1 sq meter = 1000000 sq mm)
> >
> > 0.0025 square inches gives 1.6 sq mm per connection
> > 25 square mils gives 1.6 sq mm per connection
> >
> > I'm not usually that stupid. (I hope)

OK, I'm that stupid. I give up.

Apparently the units program on the unix machine may be broken.
Or, maybe it's trying to convert inches into milliliters ;-)

I'm going to be researching this. It may confuse other people
who might try to use that "units" program.

Please, stop calling me an idiot. I admit I made a mistake.
I'm trying to fix the thing that seems to have caused my
mistake. It may be between my ears, but I'm not sure, yet.

1 mil = one thousand headaches per inch.

Thanks,

-- 
Laurence Michaels

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