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  3. Two Layer Board with copper fill on top and bottom; Problems...

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Two Layer Board with copper fill on top and bottom; Problems with Void touching Shape

NelsonsTrfgr
NelsonsTrfgr over 12 years ago

Allegro 16.3. I have created a simple two layer board with copper fill on top and bottom. This copper fill is my ground plane. I followed a manual that explained how to create the shape, assign a net name and create voids. Everything seems ok, I have several SMT footprints and through hole parts and several vias installed on the board. When I do the update DRC, it returns with no DRC errors detected. When I go to produce the artwork, I choose RS274x, select all films and create artwork. It returns an error:

 ERROR: aborting film - Shape with first seg=(841.447 1910.321) [layer=TOP]
 has a void with extents [(1771.492 748.691) (2223.750 978.392)] that touches
 another shape with first seg=(25.000 25.000). Manually resolve problem.

I followed several of the posts on this forum to attempt to resolve this issue. I moved the entire ground fill (on the top only) away from all other components. This solved the problem. I can get the artwork with no errors. When I try to pin point the offending part, it seems every part on the board will cause the error above. I selected the "Global Dynamic Shape Parameters" menu and set the minimum aperture for gap to 500 mils, along with teh suppress shapes less than 500 mils. This solves the problem, I can get the artwork with no errors. However, my ground plane has shrunk from a 2 inch x 2 inch plane to about 1/8 inch by 1/8 inch in the lower right corner (this is not acceptable). The bottom ground fill does not have these problems. It also has no SMT parts on the bottom.

I know this must be a rookie mistake. But, I followed most of the fixes that were suggested on this forum and nothing works. I also tried to merge Shapes, but this does nothing. What am I doing wrong?

Thanks, Richard

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  • NelsonsTrfgr
    NelsonsTrfgr over 12 years ago

    Hi, I have attached my allegro project, footprints, pads, etc... I still have not solved this problem. One thing I forgot to mention is I used a previous allegro *.brd project that was based on mils. However, I have tried to create artwork with millimeters. Is it possible this could be a problem?

    Thanks, Richard

     

    ept_3000_tw_u2.zip
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  • NelsonsTrfgr
    NelsonsTrfgr over 12 years ago

    Hi, I have attached my allegro project, footprints, pads, etc... I still have not solved this problem. One thing I forgot to mention is I used a previous allegro *.brd project that was based on mils. However, I have tried to create artwork with millimeters. Is it possible this could be a problem?

    Thanks, Richard

     

    ept_3000_tw_u2.zip
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