Hi Gorbo,

I loaded the dxf file into Autocad and all looked fine. Then loaded it into Vectric and created the toolpaths. As a trial I used a 3mm cutter with 12mm thick material. This created the toolpaths but the gcode file was 3771 lines long. Mach3 demo has a 500 line limit so will only show the first 500 lines, which is the first few letters. This sounds like your problem.

If so, there are 3 solutions:
Cut the letters a few at a time by creating toolpaths for groups of letters (say 2 at a time) - check the gcode file length by loading it into a text program
Pay for the full Mach 3 version
Draw around the letters in a cad program to try and create much coarser vectors, which will create less gcode - but this is tedious and less smooth

In Mach3 if you scroll the gcode window down to the bottom is it complete, or does it stop at ~500 lines? Compare it to the same gcode loaded into a text viewer to see if it has been truncated by the demo version.

I seem to remember Mach3 can run in a simulation mode if the parallel port driver is not installed, which may allow you to view larger files (therefore your home pc might show it all) whereas your garage PC with cutting capability has the driver installed and therefore has the 500 line limit when actually cutting. I might be mistaken on this one, someone might be able to help with the Mach3 arrangement.

Does this help?