Most likely is you had the design rule for Power Plane Connect styles either turned off, or improperly defined in Protel when you generated the Gerbers. Go to Design>Rules>Manufacturing>Power Plane Connect Style, and make sure the rule is enabled (check box at the beginning of the line). Also make sure that the rule is set to Relief, and the parameters are reasonable.

Less likely, but possible, is a problem with the Gerber viewer/editor. What Gerber editor/viewer are you using to look at the Gerber files? What does the aperture table in the Gerber editor/viewer say for the aperture that should show the thermal?

It may be that your Gerber viewer/editor isn't reading the aperture properly.


At 07:47 AM 3/16/05, you wrote:
Hello All,
I have a PCB design that has several ground planes in it. I have all of
the ground vias directly connected to the planes. I have all of the
thru-hole components grounds connected using thermal reliefs. If I look at
the PCB with the internal planes tab selected and with the multi layer view
option turned off, I see the thermal reliefs.


When I generate the gerbers using the embedded apertures (RS274X), most of
the thermal reliefs are gone. This only happens with the power planes. I
have several polygons in this design and their thermal reliefs are intact.


Has anyone else seen this? Does anyone know what I am doing wrong? Any
information that you can give me will be greatly appreciated. Thank you for
your time.




John Branthoover :
snip



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