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Chapter 3 G Commands
63
Ⅰ
Programming
Q value:
1) In the G18 plane, Q value is the gained viewing XZ plane along with the positive direction of Y
axis in the Cartesian right-hand coordinate system, as well, it is an angle when the Z axis
positively rotates to the the overlapping with the ellispse long axis along with the CW; refer to the
following figure:
X
Z
Starting
point
End
point
a
Z
X
a
X
Z
a
Z
X
a
Starting
point
Starting
point
Starting
point
End
point
End
point
End
point
As for the above-mentioned four coordinates (Front tool-post), angle a is the symmetry
axis based upon that it rotates to ellipse along with the Z axis CCW.
Z
X
a
Z
X
Z
X
a
Z
X
Starting
point
a
a
End
point
End
point
End
point
End
point
Starting
point
Starting
point
Starting
point
As for the above-mentioned four coordinates (Back tool-post), angle a is the symmetry axis
based upon that it rotates to ellipse along with the Z axis CW.
Fig. 3-19
2) In the G17 panel, refer to the following figure:
X
