Re: gEDA-user: pcb crooked traces

[Gabriel Paubert <paubert@xxxxxxx>]

On Thu, Oct 07, 2010 at 04:48:37PM -0700, Andrew Poelstra wrote:
> On Thu, Oct 07, 2010 at 05:37:48PM -0600, John Doty wrote:
> > 
> > On Oct 7, 2010, at 5:00 PM, kai-martin knaak wrote:
> > 
> > > (Are there any plans to make inside pcb metric?) 
> > 
> > A couple of years ago I suggested making the fundamental units
> > nanometers, since that would make decimal fractions of inches
> > exactly representable as integers down to 0.01 mil.
> > 0.01 mil = 254 nm by definition.
> >
> 
> Even on a 32-bit system, this would allow 4-meter boards,
> unless I'm going crazy. So if anyone has the tenacity to
> actually switch the units, this seems like a better idea
> than millimeters.

Besides that 64 bit have become commonplace now. You really
need signed integers in some places, and there boards
which are larger than 2 meters (for some antennas AFAIK).

I think that it should have done when switching from mil to
finer units. 0.01 mil is 254nm, and using 2nm (exactly 127 times
finer) as an unit does not sound right. On the other hand, 1mil 
was 25.4µm so 100nm would have worked. Unless you wanted to 
design chips with PCB (you don't want, use the right tool
for the job).

	Gabriel


_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user