kicad-developers team mailing list archive

[Alex G <mr.nuke.me@xxxxxxxxx>]

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On 10/11/2010 09:29 PM, Brian F. G. Bidulock wrote:
> Alex,
> 
> On Mon, 11 Oct 2010, Alex G wrote:
>>
>> Please guys, stop arguing. I agree with changing the base unit system to
>> metric, and I have already voiced that opinion. No one tried to chop my
>> throat. If it makes sense to switch to metric why not do it?
>>
>> The real question is wether it makes sense.
> 
> I have several 1000-ball BGAs on a metric pitch.  Every other ball is off
> its position by part of 1/10000th of an inch.  No problem?  Well when
> pulling dogbones for BGA breakout, I wind up with about 1000 0.1mil segments
> connecting the imperial gridded vias to the imperial gridded balls.  So
> I tried unlocking the 45-degree tracks pulling slightly off 45-degrees so
> that there were no 0.1mil segments.  Instead I got 1000 DRC errors (yeah,
> its tight in there), and a thousand 0.0mil segments.  Then there is the
> performance problems associated with drawing thousands of 0.1mil or 0.0mil
> traces.  Hard locking to a 10 nanometer minimum grid would remove all these
> problems.  Any time pads, pins or lands are on a metric pitch, the same
> problems arise.
> 
Ouch!!!

> The maximum precision allowed by RS-274X is 6.6 for metric, so it makes
> sense to use 1 nanometer as the internal unit.
>
I agree. i don't understand why Dick is so hard set against metric.
Maybe if you uploaded your branch/fork to launchpad, and enough people
started throwing their firewood on that fire, he might turn softer.

Alex
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