3-Axis Helical Interpolation Control With Center Point Designation - Mitsubishi Electric QD75P1N User Manual

9 MAJOR POSITIONING CONTROL

9.2.13 3-axis helical interpolation control with center point designation

Control details
Helical control
Tangential
control
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 Section 9.1.6
"Interpolation control" for interpolation control.)
Outline of control
X-axis: Reference axis, Y-axis: Circular interpolation axis, Z-axis: Linear interpolation axis
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).
In this control, the linear interpolation
axis (linear control) tracks the
movement of circular interpolation
control, and a helical path is drawn.
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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.
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MELSEC-Q
Positioning path
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
Unit setting
Reference axis: mm/inch, pulse
Circular interpolation axis: Same
setting as the one for the reference
axis
Linear interpolation axis: degree