I have a part that I am looking to manufacture, but I am not sure the best way to go about making it. The part is a fuel rail for a fuel-injected motorcycle throttle body. It needs to have 2 male -6 AN threaded receivers on it. The thread part is easy, a thread mill will do this job nicely. But my problem is how to machine the 37 degree taper that makes up the sealing surface. This is not a common angle that you can easily find a tapered end mill. And even if you could, it needs to be a very smooth, continuous surface to seal properly. I doubt that circle milling would give a good enough blend to acheive this.
I have seen several fuel rails from other companies that have done this very task, and the taper on their parts looks perfect, almost like it was done on a lathe. But the design tells me that there is no way it was done on a lathe, it had to be completely machined on a mill. So does anybody have an idea how to do this? Is there some type of tooling designed to act like a boring head, but creates the shape of a cone?