Thanks, that does make sense. I now remember reading that "doughnut" shapes were used to draw lines, so it must be possible to define them. Maybe I couldn't have unfilled pads because I was using an auto generated wheel file. I have also discovered an Eagle user language program that generates Gcode...

According to the Eagle forum there is no way to produce Gerber data with unfilled pads.

Pity.

Ian

Thanks, that would be the easiest way, but the Eagle CAM processor "Fill Pads" box is permanently checked, and greyed out.
I'm working on that one too!

Just found a button that mirrors the gerber output so that should help.

I think ....

Ian

Just found another problem. The mill file is generated as if you are looking from the top, therefore when milling the copper side you have to tell it that it's the component side to get it the right way round. Not too bad except the drill layout is from the top too. This means that you have to mill ...