A axis position

Hello
I'm just starting to play with 4 axis configuration and trying to mill 6 faces out of a 20mm rod.
In linuxcnc all looks good only when I don't have any G54 Z offset.
But if I have an offset on the Z axis, it looks strange.

Do I must move my machine origine to the A axis to be able to have a nice preview ?

Files to reproduce

The G-code preview assumes that the centre of rotation is the axis zero.
You just have to accept that the preview in rotary mode is nothing more than an indication. (The preview has no way to know where your axis of rotation is, the G-code does not include that information)

I agree but the preview is just an indication but in this case it is misleading : On the second preview it may look like the path will be out of machine boundaries but in fact it is not.

The preview has no way to know where your axis of rotation is, the G-code does not include that information)

The axis position, as it is machine dependent, should rather be in the INI file

2.9 and up:

> 10. Rotations applied after translations may use the "!" provision to act with
> respect to the current machine offset. Example: GEOMETRY=!CXYZ translates the
> control point to the X, Y, Z position and then performs a C rotation about the
> machine origin displaced by the current G5x,G92 X, Y, Z offsets. (Changing
> offsets may require a program reload).

Ref:

linuxcnc.org/docs/2.9/html/config/ini-config.html

github.com/LinuxCNC/linuxcnc/commit/c392629

 

Wow
That's great image missing /media/kunena/emoticons/cheerful.png