kicad-lib-committers team mailing list archive

[Carl Poirier <carl.poirier.2@xxxxxxxxx>]

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 <keruseykaryu@xxxxx> 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
>
>
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