Depends on what you want and how much you want to spend. There is laser drilling equipment out there that will drill <5um (that's 0.000197") diameter and can do laser milling to any shape and angle you want. I don't think our equipment has that resolution, but it is out there. You could make ovals, rectangles, stars, etc., and angle them to add swirl or variable angles on each one using a 5 axis laser mill. For example:How big an injector would a 7.3 need to be runnin for something like this to work? I notice the guys says they can only acurately do these in large injectors.
Anybody in the PSD world workin on anything like it?