The fly cutter is a wonderful tool for creating a flat surface. It covers a larger area than a milling cutter and doesn’t leave rows of cut marks.
Taig supplies blank arbors to fit the headstock for $3.20 (Lee Valley), not worth making that yourself. A bit of time and voila, a fly cutter. I used the compound table to get the angle and the milling vise to hold the arbor for drilling a 6mm hole for the cutter and 10-32 tap hole for the locking screw. The ER16 collet holder came into play to hold a 3/8 milling cutter for the wrench flats. I promise to start taking more photos to show the sequence of operation, though sometimes that takes longer than the work itself.
Next one I build the hole for the cutter will be off centre, the present one makes me grind too much off the cutter. The goal is for the point to be on the centre line.