kicad-developers team mailing list archive

[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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-- 
Jean-Pierre CHARRAS