Re: gEDA-user: Metric PCB footprints using 1mil grid

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

My suggestion would be to just dump the old libraries. Why build new
boards with obsolete land patterns.

Steve Meier

DJ Delorie wrote:
>> The current resolution of pcb being 0.01 mills which translates to 254
>> nano meters (~1/4 of a thousandth of a mm)  should meet the requirements
>> for printed circuit boards for some time (metric or english).
>>     
>
> The problem isn't what pcb supports now, it's what pcb used to
> support.  We used to support only 1.0 mil resolution, and chunks of
> our library are still defined at that resolution, even the metric
> parts.  Which means fine-pitch metric parts don't have consistent pad
> widths, due to rounding.  Gerber output normally goes to higher
> resolutions anyway, so a metric footprint that's always kept in 0.01
> mil mode (hi res) won't suffer the same rounding errors as one that's
> been rounded to 1.0 mil resolution.
>
>
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>   



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