How big are the parts? This is a common problem with boat building, there's a few threads in CNCZone about getting gcode from hull drawings.
If you can't digitize it because they're too big, or you don't have a digitizer, then you could just reverse the lofting process manually. Do a google on lofting or boat table of offsets. Grid the part with 1" ( or other appropriate scale) spaced grid squares and take a set of offsets ( x,y from a known center or station line) from it. Enter the offsets into your cad and then fair the curves. If the part is a station mold and symmetrical then you can copy the one side to the other.
Andrew |