If you use autocad, then ace, you need to verify the tool path in Kcam or similar before cutting. In the rcgroups forum a fellow suggested Quikview, which is an autocad plugin that can be used to view gcode files. I tried it and it messed up on the arcs. In the mean time I forgot about it (as I do with all software that doesn't work). Then the guy who wrote it contacted me last week and asked for a couple of my gcode files so he could fix the app. He fixed it and it works perfect now.
Here is the link:www.gsktechnologies.com/En/freeapps.htm
The real beauty of this app is that the resulting toolpath can be saves as a dxf file, which means it can be used as a gcode to DXF convertion tool.
So lets say a guy sends you a gcode file of something cool but you need to scale it or modity it slightly, just open in Autocad using Quickview, scale/modify, save, reconvert with ace, you're good to go!
I wish it wouldn't crash.
i tried the link, and the program i got messed up my arcs. i use ace converter to convert my dxf to g-code.