Quote Originally Posted by Voicecoil View Post
Mmmm, how are you machining your cones? From the height of your product I would have thought a horizontal/4th axis approach would work better than the vertical machining I'm doing - mine are only either 24 or 34mm tall. For even the 150mm high version you would need something like a 175mm cutter which is going to be neither particularly rigid or cheap I would guess.
You are quite correct, I am working on a 4th Axis at the moment for my machine.
What I actually want to achieve is a cone with a slight twist, about half a turn over the length, but with the number of thread starts (flutes) converging to the top (small dia of cone) and fading outto a plane cone.
Hard to describe, but similar to a piece of cloth being wrung out when wet.

Probably should start a separate thread for this when I've got the 4th Axis on the machine working and just watch this thread