Helical gear calculations

[Lo-Fi]

I was under the impression you needed a universal type milling machine with a swiveling table to cut these types of gears.
Is this not true?

Nah, as long as you can tilt the head to the required angle you're good to go. Not as rigid as the universal horizontal, maybe. Keith Rucker went through it all in some recent videos, ended up using the tilting head on his K&T, rather than the universal table as his 45 degree helix didn't work in that setup.