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Date: Thu, 20 Oct 2011 19:55:15 -0700
From: Andrew Poelstra <asp11 AT sfu DOT ca>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Working with a 0.1mm grid
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On Fri, Oct 21, 2011 at 01:41:18PM +1100, Stephen Ecob wrote:
> >> For example, a value of 1.27mm could be output as 5000 cmils but a
> >> value of 0.1mm would be output as 0.1mm (or 100um, etc)
> >
> > That would be nasty. The suffix code should be consistent.
> >
> > I'm pretty sure we could use the "mil" and "mm" suffixes and not ever
> > lose precision, even when loading from old versions of pcb.
> 
> I think that reading in using "mil" and "mm" suffixes without loss of
> precision isn't the problem.
> 
> I think that the problem is that PCB throws away precision of metric
> values when saving.
>

Yes.

The question is, how precisely can we save, without producing files that
old versions of pcb can't read? 

-- 
Andrew Poelstra
Email: asp11 at sfu.ca OR apoelstra at wpsoftware.net
Web:   http://www.wpsoftware.net/andrew