Huge Bend Die Machined on Tiny Mill

I needed to “repurpose” a bend die that I have never used, and had to work out a way to do the machine work. The die was made for 2.5″ tube on a 10″ centerline radius, so it is a chromoly disk 20″ diameter and 4.5″ thick. The best plan I could come up with for machining it was to mount it on a rotary table on a horizontal mill and machine the groove with a fly cutter set to 3″ diameter. My biggest rotary table is only 8″ diameter, so it was dwarfed under the die. I then drove the rotary table with an old wire feeder from a MIG welder. Worked great!