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Chapter 9 Major Positioning Control
9.1.6 Interpolation control
Meaning of interpolation control
In "2-axis linear interpolation control", "3-axis linear interpolation control", "4-axis
linear interpolation control", "2-axis fixed-feed control", "3-axis fixed-feed control",
"4-axis fixed-feed control", "2-axis speed control", "3-axis speed control", "4-axis
speed control", and "2-axis circular interpolation control", control is carried out so
that linear and arc paths are drawn using a motor set in two to four axis directions.
This kind of control is called "interpolation control".
In interpolation control, the axis in which the control system is set is defined as the
"reference axis", and the other axis is defined as the "interpolation axis".
The QD77MS controls the "reference axis" following the positioning data set in the
"reference axis", and controls the "interpolation axis" corresponding to the
reference axis control so that a linear or arc path is drawn.
The following table shows the reference axis and interpolation axis combinations.
QD77MS2 QD77MS4 QD77MS16 Axis definition
Interpolation of
"
Da.2 Control system"
Referenc
e axis
Interpolation axis
Referenc
e axis
Interpolation axis
Referen
ce axis
Interpolation axis
2-axis linear interpolation control
2-axis fixed-feed control
2-axis circular interpolation control
2-axis speed control
Any of
axes
1 to 2
"Axis to be
interpolated" set
in reference axis
Any of
axes
1 to 4
"Axis to be
interpolated" set
in reference axis
"Axis to be
interpolated No.1"
set in reference
axis
– Axis 1 Axis 2, Axis 3
– Axis 2 Axis 3, Axis 4
– Axis 3 Axis 4, Axis 1
3-axis linear interpolation control
3-axis fixed-feed control
3-axis speed control
– Axis 4 Axis 1, Axis 2
" Axis to be
interpolated No.1"
and "Axis to be
interpolated No.2"
set in reference
axis
– Axis 1
Axis 2, Axis 3,
Axis 4
– Axis 2
Axis 3, Axis 4,
Axis 1
– Axis 3
Axis 4, Axis 1,
Axis 2
4-axis linear interpolation control
4-axis fixed-feed control
4-axis speed control
– Axis 4
Axis 1, Axis 2,
Axis 3
Any of
axes
1 to 16
"Axis to be
interpolated No.1",
"Axis to be
interpolated No.2"
and "Axis to be
interpolated No.3"
set in reference
axis
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