Homebrew PCBs

On Fri, 01 Sep 2006 00:18:05 +0200, herby1620 <herby1620@...> wrote:

> Thickness in um =
>     0.5 * 10000           454
> ---------------------- * ---- = 17 um
> 2.54 * 2.54 * 16 * 144   8.94
> Some of the numbers used (for reference):
> 0.5 = ounces/sq-foot (amount of copper)
> 10000 = um/cm (microns per cm)
> 2.54 = cm/inch
> 16 = ounces/pound
> 144 = square inches/square foot



I certainly know _why_ i love the SI! That's just frightening...

I certainly also love google - enter the following line as a search term:

8920kg/m^3*1ft^2*35micrometer in oz

and you get

1.0230976 ounces

The good thing about google calculator is it can deal with units and do  
the conversions for you. And if you have a mistake in the formula, like  
divide somewhere instead of multiplying, the result will just not come out  
in the correct unit. If i do that on paper i need to engage brain to check  
that....
Sadly it does not (yet) know the density of copper automatically it seems.


ST