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2 different isolation widths for polygon fill

KX36

Hi guys, me again with another newbie EAGLE question.

 

I have a circuit that is mostly pretty standard tame voltages, but various points on it run at high voltages. I want to be able to have a wider isolation width for these high voltage traces from my polygon ground fill. A little experimentation has found that if I draw 2 overlapping polygons, whichever has the tighter isolation is drawn, so what I have been trying to do is cover the whole board with the wide isolation, and then go back over the low voltage parts with the narrower isolation.

 

Here's the sort of thing I want in the end: (just a picture from google) http://koti.japo.fi/~tivahal/Brisant/PCB_unpop.JPG

 

This isn't ideal because some places it is difficult to avoid either encroaching on my wider gaps or leaving dents and holes in the fill, and it's not so easy to leave an island of wide gap in the middle of a small gap polygon. I'm sure I'm not the first to want to do this. Is there an easier way to go about doing this?

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    On 8/11/2011 2:50 PM, KX36 wrote:

    Hi guys, me again with another newbie EAGLE question.

     

    I have a circuit that is mostly pretty standard tame voltages, but various points on it run at high voltages. I want to be able to have a wider isolation width for these high voltage traces from my polygon ground fill. A little experimentation has found that if I draw 2 overlapping polygons, whichever has the tighter isolation is drawn, so what I have been trying to do is cover the whole board with the wide isolation, and then go back over the low voltage parts with the narrower isolation.

     

    Here's the sort of thing I want in the end: (just a picture from google) http://koti.japo.fi/~tivahal/Brisant/PCB_unpop.JPG

     

    This isn't ideal because some places it is difficult to avoid either encroaching on my wider gaps or leaving dents and holes in the fill, and it's not so easy to leave an island of wide gap in the middle of a small gap polygon. I'm sure I'm not the first to want to do this. Is there an easier way to go about doing this?

     

    Have you tried setting different net clearances in the net CLASSES ?

     

  • 0 in reply to Former Member

    Thanks a lot, that's spot on what I was looking for. It's pretty well hidden within the GUI, so not knowing what this function was called to search for, I couldn't find it. I know a lot of long-term users use the command line a lot, but having only came to EAGLE in version 5, I tend to use the GUI for everything.

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