Milling Fret Slots on an Undersized CNC Machine

T-Slot Covers For Milling Machines cnc slot I used to cut slots the stupid way Until very recently I CNC machine with GRBL: https:www cnc slot If you're trying to mimic a slot like you'd get with the cutters you mentioned, you can try using a ball end mill and program an arc move in the XZ

elfa twin slot shelving After you cut the slots, use a 60 degree V bit 025 deep in your fret slots to make inserting the frets much easier This is just a CnC version