The tool axis will be approximated to the lines you created in your geometry. In the example below you can see four lines and the generated toolpath. As you can see the tool axis near to the lines have the same direction. Between the lines the tool axis changes constantly the angle to the new line angle.
Select "tilt lines" and choose the lines from your geometry or define the line by values. If you choose the lines from your geometry please make sure that the chain shows to the same relative direction. This should be that all lines show away from your drive surface or all lines show to the drive surface. If you mix the directions of the chain the tool will also make these direction changes.
Further you have to choose the tilting between the tilt lines.
All lines weighted by distance
Here the direction of the tool axis will be approximated through all lines which are close to your toolpath. So if you have many lines tilted in different direction, the tool axis is tilted with the average of these lines.
That means also that with this option you’ll almost never have the same orientation of a specific line.
In the picture you can see the green drive surface and the four orange tilt lines. As you can see the toolpath will be approximated trough all lines, which means the orientation of the tool axis never has the same orientation like a single line.
Always closest two lines
Here the direction of the tool axis will be approximated through two neighbouring lines along the toolpath. These lines are also the closest to each other.
The result is that the tool axis will have the exact orientation like the tilt axis.
In the picture you can see the green drive surface and the four orange tilt lines. As you can see the toolpath will be approximated trough only two neighbouring lines, which means the orientation of the tool axis is the same orientation like the tilt lines.