Re: gEDA-user: pcb, how to remove mm garbage (very short lines)?

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

I think the base should be one Angstrom for two reasons. 1) that it
would be 10x the resolution of the pads. 2) According to wikipedia (with
the ångström being officially discouraged by both the International
Committee for Weights and Measures and the American National Standard
for Metric Practice).


Steve Meier

On Wed, 2008-11-19 at 10:22 -0800, Steve Meier wrote:
> The Pads ASCII format uses a base unit of 0.00000002624671916 inches
> which is 1.0333354 nM
> 
> Converting it to metric causes an error of about 0.5 nM
> 
> The PCB base unit is 0.00001 inches 
> 
> Converting it to metric causes an error of 19.7 nM
> 
> All I can figure out about why pads uses that weird number is that
> multiplying it by 38100 converts the base unit to mills
> 
> Multiplying it by 9678 converts the base to 10 microns with an error
> of .6 nM
> 
> 
> So making the base smaller will reduce error (no surprise) the question
> is what is a tolerable error?
> 
> 
> 
> 
> 
> 
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