Interpolation turning on a Milling machine! : ) : r/Machinists Reddit
You could program a .125" ball mill to do the helix either long form by hand, parametric, or with code loops. That way you'd meet the industry spec for the serrations radius. Any Cam software would do it too. The controller might even have a canned cycle for this. OP doesn't state the controller so we just don't know. Edit, spelling.