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9.2.12
3-axis helical interpolation control with sub point designation
In the 3-axis helical interpolation control, circular interpolation control is carried out with two of the three axes. The
other axis tracks the movement of the circular interpolation control to carry out "helical control "or "tangential control".
(Refer to Page 359, Section 9.1.6 for details on interpolation control.)
Control details
Z axis
(mm/inch/pulse)
Z axis
Helical control
Y axis
Tangential
control
X-axis: Reference axis, Y-axis: Circular interpolation axis, Z-axis: Linear interpolation axis
(1) Helical interpolation control speed
The command speed of the 3-axis helical interpolation control is the same as the speed of circular interpolation
control (composite speed of reference axis and circular interpolation axis).
End point
Z axis
Y axis
Start point
X axis
402
Outline of control
Y axis
X axis
End point
Start point
X axis
A linear interpolation axis tracks
the movement of circular
interpolation control.
The command speed of this control
is same as the speed of circular
interpolation control.
End point
In this control, the linear interpolation axis (linear control)
tracks the movement of circular interpolation control, and
a helical path is drawn.
■Unit setting
• Reference axis: mm/inch, pulse
• Circular interpolation axis: Same setting as the one for
• Linear interpolation axis: mm/inch, pulse
Start point
In this control, the value of the linear interpolation axis
(degree) changes according to the movement of circular
Z axis
interpolation control to keep the direction of a workpiece
(degree)
to the center point of the circular interpolation control. The
figure on the left shows an example of the control that
keeps the direction of the workpiece in the tangential
direction.
■Unit setting
• Reference axis: mm/inch, pulse
• Circular interpolation axis: Same setting as the one for
• Linear interpolation axis: degree
Positioning path
the reference axis
the reference axis
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Troubleshooting
