kicad-developers team mailing list archive

[Vesa Solonen <vesa.solonen@xxxxxxxx>]

jp charras kirjoitti 19/09/17 klo 10:47:
> Le 18/09/2017 à 23:15, Oliver Walters a écrit :
>> 100mil is very coarse for elements other than pins to be placed. I think there are cases where we
>> need to change code to match KLC but I don't think this is necessarily one of them. 
>>
>> 50mils is easy for placing pins, just have one grid dot between each pin! Plus the grid spacing is
>> accessible with the right click menu and I often have to change it for various reasons anyway...
> 
> Moreover, to create "symmetrical" shapes (symmetry relative to the X axis) like many gates (and op
> amps) with even number if inputs, you often need to place them at y = + 50 mils and y = -50 mils and
> 100 mils step between pins, therefore using the 50 mils grid
> 
> Using (to place pins) *a* 100 mils grid is not using *the* 100 mils grid.
> 
> So starting on a 100 mils grid is not a good idea.

It's probably a good idea to follow the standards in question: IEC/EN
60617. They pretty obviously require the ~100 mil grid. If these rules
are not followed the schematics may not be accepted in professional use.

Symmetry issue is not an issue if the drawing application is somewhat
smart, meaning that the snapping grid takes pins as snapping points
instead of the symbol center while placing symbols.

Currently placing stuff on 100 mil grid needs tedious concentration or
no odd grid primitives in the library. It would be nice to get this
fixed by pin snapping.

-Vesa