Clearances not enforced on filled zones (under estimates)

[Jt Whissel]

The clearance for this top layer ground fill is set to 4mil There are several spots (this was the worst one I could find) that the clearance is not respected. If it should go above the clearance limit but should never go under. This can cause manufacturing issues, higher manufacturing costs (if you're under 4 then you pop into the 3mil tier, etc).

Application: kicad
Version: no-vcs-found-0564d34~61~ubuntu17.10.1, release build
Libraries:
    wxWidgets 3.0.3
    libcurl/7.55.1 OpenSSL/1.0.2g zlib/1.2.11 libidn2/2.0.2 libpsl/0.18.0 (+libidn2/2.0.2) librtmp/2.3
Platform: Linux 4.13.0-17-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.3 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.62.0
    Curl: 7.55.1
    Compiler: GCC 7.2.0 with C++ ABI 1011

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_SPICE=ON

[Nick Østergaard (nickoe)]

Could you please attach the kicad_pcb file which shows this violation?

[Jt Whissel (jtwhissel)]

Unfortunately I can not since it's not mine to share (I use Kicad professionally). However, I did my best to make a sample board of the problem. It shows off the trace to fill clearance issue and the fill to self-fill clearance issue.

[Nick Østergaard (nickoe)]

Thank you, that should be good.

[jean-pierre charras (jp-charras)]

I am afraid your understatement of "clearance" is wrong.

The board has only one zone defined (with no netname).

A clearance has meaning only between objects belonging 2 different nets (this is not the case here).
One cannot define a clearance between 2 objects of the same net, because they are expected to be connected, therefore most of times the clearance is (obviously) 0.

It is unlikely we can fix your problem.

[jean-pierre charras (jp-charras)]

"I am afraid your understatement"
Please, read:
I am afraid your understanding ...

Sorry.

[Jt Whissel (jtwhissel)]

New evidence of the problem happening with two different nets as well. Should round up instead of down.

[Jt Whissel (jtwhissel)]

This is measured in gEDA Gerber viewer. The measured distance is at the bottom right. clearance is set to 4 mils.

[Jt Whissel (jtwhissel)]

Here is the kicad file, the clearance issue is on the right side of the first pad hole to ground.

[KiCad Janitor (kicad-janitor)]

Fixed in revision 673f03e59525a6cdfd97739906d50c9510a94d0d
https://git.launchpad.net/kicad/patch/?id=673f03e59525a6cdfd97739906d50c9510a94d0d