I just posted a new version of my GcodeOutL.fas. It's a compiled lisp program that writes a cnc file for a Lathe. (Recognizes Autocad polylines.)
In addition to generating a Lathe tool paths for OD and ID, This latest version includes ID and OD Grooves.
The Grooving function will rough plunge (center out cuts) and finish a groove. The groove can have angled sides and bottom corner radii. (each side different). Optional edge break on top.
See the "Autocad Download" section wjbzone.com.