Mitsubishi Electric MELSEC-L LD75D, User Manual

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9.2.13
3-axis helical interpolation control with center 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 Interpolation control (

Page 359, Section 9.1.6) for details on interpolation control.
X-axis: Reference axis, Y-axis: Circular interpolation axis, Z-axis: Linear interpolation axis
Control details Outline of control Positioning path
Helical control
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 the reference axis
• Linear interpolation axis: mm/inch, pulse
Tangential control
In this control, the value of the linear interpolation
axis (degree) changes according to the movement of
circular interpolation control to keep the direction of a
workpiece 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 the reference axis
• Linear interpolation axis: degree
Z axis
(mm/inch/pulse)
Z axis
Y axis
X axis
Start point
End point
Y axis
End point
Start point
X axis
Z axis
(degree)