After some help files and some guesswork, I think I have come up with a workable solution to engraving PCBs with EngraveLab. The previous problem was that it did not import the pads properly from a GerbTool generated HPGL file, and it didn’t do the tracks correctly when importing from a GerbTool generated DXF file. The small workaround is to import both files and then lay one on-top of the other, select both, click a single layer so they are both become the same color, and then do a “basic weld” to join the shapes into one. To be specific, export HPGL with outline selected and with a pen that is very small (0.0001″ works fine). Next, import this HPGL file into Engravelab and when it is selected, perform a basic weld to join all of the parts of the tracks together. Finally, import the DXF file and weld that to the tracks. Now a male toolpath can be created which will go around all of the traces and pads. I am still working out good speed and depth settings for 1oz copper plate and how to do the drilling, however, there is a drill toolpath editor in EngraveLab so that looks promising. As usual, more on this later. (previous post)
Another option that I have been looking at is editing the layer in GerbTool by using tools->convert->draw to pad or something like that. This way, you select all of the tracks and convert them to pads, and then when you export the HPGL with the pads-only option selected, the right looking artwork comes out. The trouble is that the toolpath is on the inside of the design instead of outside. Setting the pen size to 1mil or less makes it looked filled in, but then you still have to generate the appropriate toolpath for the contour.