I’m seeing what I think is a bug in the DRC. I’m getting
In reality this track is 4 mm away from the polygon it claims is too close, but I notice that there is a kind of ‘ghost’ polygon (the dots in the image in Part 2 of this post) which I can make appear by right clicking on the error message and choosing to view the polygon. Anyone have any ideas?
As seen from the DRC message the polygon you see is a graphic polygon.
Graphic polygons are used to fill the area on the board with copper to maintain the thickness of the board. This is necessary as the board will need to be clamped for various processes throughout fabrication, and maintaining copper thickness in certain areas of the board ensures even clamping.
To add a graphics polygon:
Select the graphics polygon icon in the vertical toolbar ( the mouse pointer is on the icon in the image )
A month later, with a brand new design I’m seeing exactly the same nonsense. It’s complaining about a via that is nearly 100 mm away from the polygon, while another via 5 mm away is apparently OK.
The polygon in question is part of a printed microwave decoupling stub in the form of a quarter segment of a circle. The segment is made up of enough triangle ellipses joined at the ends with a thick arc to smooth things out. Is there something about that construction that’s illegal?