Originally Posted by HuFlungDung Wow, I've never thought of trying to do thread milling that way. Unless you are milling some extreme leads, this kind of provision is unnecessary. Tilting the head would require a continuous precession motion to tilt the cutter to all planes as the advance is made down the helix. I don't think the shank of the cutter would allow you to get very far down the hole to do this, if you had to 
But, I do use OneCNC and a helical path with spiral lead in/lead out for thread milling of standard pitches. |
You got me there. I hadn't thought of the implications of tilting the head in that manner. I'm presently milling some threads (in which to insert a jar) manually using a homemade fixture. Since tilting the fixture 1deg 31' was so simple, I didn't bother to try doing without that. (That's for a six pitch 2-1/8 diameter, roughly.)
I was just curious, anyway. I don't have even a three axis machine. A five axis machine would make MY head spin.
Ken