kicad-developers team mailing list archive

[Cirilo Bernardo <cirilo.bernardo@xxxxxxxxx>]

Hi Eldar,

 The problem I have is that different standards have different
orientations. Even IPC now have "Orientation Level A", which is what is
described in 7351B, and another one where Pin 1 is in what the EIA
packaging standards call "Quadrant 3" (bottom left). The EIA specification
in turn specifies a different orientation for Pin1 depending on the SMT
package. To make things worse, some manufacturers provide the same part in
different orientations on tape. So while I can specify that the given
orientations are according to IPC-7351B, to help users determine the
orientation without ambiguity, it is good to have the Pin1 location in the
position file as well.

- Cirilo


On Wed, Jun 15, 2016 at 2:21 AM, Eldar Khayrullin <eldar.khayrullin@xxxxxxx>
wrote:

> Look at IPC 7351 - 16 ZERO COMPONENT ORIENTATIONS and Figure 16-1.
>
> В Вторник, 14 июн. 2016 в 6:53 , Cirilo Bernardo <
> cirilo.bernardo@xxxxxxxxx> написал:
>
> Hi folks,
>
>  Some assembly houses prefer to have a Pad1 location in addition
> to the part centroid location; this makes the orientation of the
> component unambiguous and can help in cases where the user's
> footprint doesn't align with the tape orientation of a component.
> Would this be a useful addition to the placement file or are there
> any objections to it?
>
> - Cirilo
>
>