Thread cutting unusual way?

One maybe silly question

I wonder if the following is possible with a mill that has encoder on spindle:

I mount a threadcutting turning tool in a small flycutter.
I run the x y axes round a cylinder in a big circle in a manner that the cutting tool stays always square to the surface with synronized spindle turning. Descending in a spiral.
Making the circle smaller from cycle to cycle should result in a thread.
Similar it should be possible to make an inside thread.

Is this possible with lcnc?

That sounds like thread-milling, and ought to work, albeit slowly with a fly cutter. (a lot of dead time)

Look at YouTube videos of thread milling.

Another way is to use a boring head:

Yes and no Andy
I want to have the flycutter be square as in the video, BUT
make the circle movement by X and Y axes moving.

Yes lot of time but surely nice to watch. For a hobby guy.
One idea is to try a screwable head for a diving-scrubber with ca 220x5mm thread. In POM-C
Maybe crazy, but why not give it a try.
Mike

Mike_Eitel wrote: Yes and no Andy
I want to have the flycutter be square as in the video, BUT
make the circle movement by X and Y axes moving.

That is thread milling.



And it can be done single-pointed:


The G-code is trivial. G2 I-20 Z-10 P10 would cut a 1mm pitch thread 40mm diameter and 10 long.

Yes Andy
I know that...but also the prices for such tools. And the fragility

And also the according gcode. And new i will have a encoder on my mill.
And as fare as i understood there is no way to synchronize x,x and z spiral move combined with spindle.
But wanted to throw that in discussion.
Mike

@Mike,

You have to write the pitch value of the z-axis yourself. It can also be a cone pitch if you want, but you know.
Spindle value (rotating speed of milling tool) is related to tap cycle. Itś a custom industial made m or g code i think, for example:

M843 (Synchronous Rotation command)

www.cnctrainingcentre.com/news/rigid-tapping-g84-canned-cycle/

Nope Grotius
It is not posible with rigit tapping.
Mike