So I need to machine some aluminium parts that have a number of undercut retaining lugs - pretty small maybe 2mm high undercut by 0.5...0.7mm. I think I can sort the Gcode by getting the CAM to make the overall path and frigging the in and out paths by manual editing. BUT I need an appropriate cutter - a bit like what you'd use for making T-slots but much smaller - anyone got any ideas please?

BTW, the simple manual approach using a file isn't possible since these lugs are down inside a cavity :-(