Hi Kerusey, In order to reach more people, I restarted the conversation on the developer's mailing list. I will reply there.
Carl On Sat, Apr 19, 2014 at 1:43 AM, Kerusey Karyu <[email protected]> wrote: > W dniu 06.04.2014 01:55, Carl Poirier pisze: > > >> At this point, we shall to ask: How many users use SI units when >> drawing schematics? Most of them will look at grid only and doesn't >> care about mm or inches. >> Units of measurement are important, but where they are actually >> required to maintain strict dimensions. >> >> >> If you look at the metrication of the world, you will notice people >> using the imperial system are getting scarce these days. >> http://en.wikipedia.org/wiki/File:SI-metrication-world.png >> >> IMHO this picture isn't an argument here. > > > > If we force 4mm or 2.5mm of pin length these pins will be outside of >> the grid when somebody uses inches. IMO this is not the way we >> should follow. >> >> >> Same can be said when one uses the SI system to draw his schematic. >> >> If he only switch from inches to mm using Eeschema left toolbar nothing > will happen. The grid remains the same. > > As I said before, I'm using grid points for reference and don't care about > current units when draw a schematic. And I'm sure that many people do the > same. > For me the grid in inches is better because it's easier to multiply simple > numbers like 0.05" than 1.27mm. > > > > (...) unless the manufacturer places the components in a different >> orientation in tubes, tapes or trays (Important for P&P). >> >> >> Good point. Can you tell me, for a device that's made by many >> manufacturers and sold in such packages, do they all use the same >> orientation? >> >> http://www.ti.com/lit/an/szza021c/szza021c.pdf > A very interesting table on pages 12-14. One manufacturer and different > pin 1 location in tape, even for the same packages. For example package > widely known as SC-70-5: DCK3 pin 1 on lower left quadrant, DCK2 > pin 1 on upper right quadrant. > > > > Regards > Kerusey Karyu > > > -- > Mailing list: https://launchpad.net/~kicad-lib-committers > Post to : [email protected] > Unsubscribe : https://launchpad.net/~kicad-lib-committers > More help : https://help.launchpad.net/ListHelp >
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