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). >> >> >> >> >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~kicad-developers >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~kicad-developers >> More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~kicad-developers > Post to : [email protected] > Unsubscribe : https://launchpad.net/~kicad-developers > More help : https://help.launchpad.net/ListHelp -- Jean-Pierre CHARRAS _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
