kicad-developers team mailing list archive

[Bastian Neumannn <neumann.bastian@xxxxxxxxx>]

Hi

> Ultimately is it useful to design a board, if you cannot make it?

Right now I can fabricate boards, I can not design. That is also not a good
solution.

via constraints are tricky bussiness as they are very specific to the
manufacturer.

> PS:
> The current "tracks and vias editor" dialog is (for me) a not finished
work:
> It does not make any DRC test after editing, and this is *really
annoying*.

This is what I am working on at the moment. To have a propper mask where
one can input constraints for vias.

At the moment you can only define some layers. There is much more work to
do. Like staggered/stacked µvias

[image: Inline-Bild 2]

Based on this dialog I plan on having more layer masks to only show layers
described here.

Cheers

2017-08-22 13:00 GMT+02:00 jp charras <jp.charras@xxxxxxxxxx>:

> Le 22/08/2017 à 12:10, Simon Küppers a écrit :
> > I second this. Working in a Research Institute I can assure you, that
> very often there are circuit
> > boards with "interesting" stackups and via configurations... These
> boards are not produced by
> > quick-turn factories like eurocircuits but companies such as ILFA or
> Optiprint.
> >
> > It would be unwise to cut out those users from KiCad.
>
> I dont't remember I said we should restrict vias to eurocircuits
> constraints.
>
> Moreover "very often there are circuit boards with "interesting" stackups
> and via configurations"
> lead me to think there are constraints, unless I missed something.
> (if there are "via configurations", there are constraints)
>
> I don't think eurocircuits is at quick-turn factory (although I have
> myself any experience about
> blind/buried vias) but I think blind/buried vias can have constraints,
> because I saw constraints in
> board houses.
>
> Ultimately is it useful to design a board, if you cannot make it?
>
> In fact, Pcbnew is really lacking a board stackup editor, to define not
> only the stackup layers, but
> some other parameters (via parameters, copper thickness, dielectric
> thickness and type, and a few
> other parameters).
>
> This board stackup definition is needed not only for vias, but also for
> impedance controlled boards.
>
> PS:
> The current "tracks and vias editor" dialog is (for me) a not finished
> work:
> It does not make any DRC test after editing, and this is *really annoying*.
>
>
> >
> >
> > Am 2017-08-22 09:57, schrieb hauptmech:
> >> On 22/08/17 18:25, jp charras wrote:
> >>> Le 22/08/2017 à 05:55, hauptmech a écrit :
> >>>> Manufacturing techniques vary between manufacturers and continuously
> evolve. Why would kicad limit
> >>>> itself to what eurocircuits can do? They have optimized their process
> for quick turn prototyping
> >>>> and
> >>>> while they document their process nicely, they are probably not a
> good reference for what can be
> >>>> done.
> >>>>
> >>>> On 21/08/17 05:44, jp charras wrote:
> >>>>> Before working on blind and buried vias dialog, please have a look
> at:
> >>>>> https://www.eurocircuits.com/blog/Blind-and-buried-vias
> >>> Currently there is no control in Kicad.
> >>>
> >>> Sure, but it looks like there are some constraints on blind/buried
> vias (microvias are blind/buried
> >>> vias) depending on board houses.
> >>>
> >>> So it could be worth to be able to control these constraints inside
> Kicad (at least to have a
> >>> minimal control).
> >>>
> >>> We currently have a DRC which detects too small clearances and track
> widths:
> >>> this is most of time due to manufacturing constraints which
> continuously evolve.
> >>>
> >> I don't think I have enough understanding of the proposal to have an
> >> opinion. I just want to caution against creating unnecessary
> >> limitations in kicad. It really depends on the board house. I used to
> >> work for one and there were quite a few atypical techniques used for
> >> customer specific projects (many kept confidential to that customer).
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
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> >
> > _______________________________________________
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>
>
> --
> Jean-Pierre CHARRAS
>
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