-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJMs1mTAAoJEL0kPHNPXJJKTkQP/RTfUCHfAGrLGInw0WB6Fttt TXKgSpMdR2fpI3EyMQ/+Jzu8Z9iYjz+nq2kA0iIxagwBwOOStAi6CBaK6crSnPut 1KrdAgcRihGuW/970TnSgbgZT6cBG9J/sqiR1onPnpJIJyIeESG3PrOKod4ZKgYR clwxjl0WxGefBhptIEqPEf1IjbghvZ+O7jtr9jFD0aANrEBh0FZT6VzqKOpjxx5F JdTp5ho4SL3Lw8kOeKIOoCXXfIi1ICmUsAxjhyV5cHv3HuVYIZgvobJNSxEcNINq kgFahyZdBjze6uAuLKJB5RmxLAKt30vfOIsRFVfM7a7CL5XmV72l5fLqED8o88AC nz8T8nIQ9PXM4hrFRIEBhnynfA7tUCfIoIgAdkaYY+x+LL9j3nC8tpzCQF7rYP6D caRV5VDyr+4bFn196ra0saENdaDV7KOHjr7dO78mYFUJvjJKj3kGGUMZmyxmX/Ol Ej7zvuhClB28EZKdF1hkvp80jfHHqbCHF0by8ueXKOnWyQdMqTAaGDZPlfwjL1F6 7JMjmkXq1Dhc2gYFa9ERL3LAruOK0eN74LLVv10rGYlS605HMm73/doupWGt1RIB 7sehW/UHaT9jXQl1vDM/c+HJv3zuGfKk4SVNd5y8EVtUOXLkMTMv4OnVcrD0XUbH t2skt+gwYLrHwhZzwu2U =CQdX -----END PGP SIGNATURE----- _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp