Mitsubishi Electric MELSEC-L LD75P User Manual page 411

(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
When "0: Composite speed" is set in "[Pr.20] Interpolation speed designation method", the command speed of ABS3/INC3 is
the same as the composite speed of the 3 axes (x axis - y axis - z axis). The command speed of 3-axis helical interpolation
control is the same as the composite speed of the circular interpolation axis (x axis - y axis). When continuous path control is
carried out in ABS3/INC3 and 3-axis helical interpolation control, adjust the command speed to prevent the workpiece from
moving unsteadily because the workpiece movement speed may change when positioning data is switched.
(2) Rotation angle of the circular interpolation axis (X axis - Y axis)
The following shows the rotation angle of the circular interpolation axis in 3-axis helical interpolation control.
True circle
Y axis
Number of pitch
0
1
2
to
n
to
999
A true circle can be set only when the start point equals to the end point in 3-axis helical interpolation (ABS/INC,
center point).
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.
θ = 360°
Start point = End point
X axis
True circle
360
720
to
360  n
to
360  999
CHAPTER 9 MAJOR POSITIONING CONTROL
Other than true circle
Y axis
θ
Circular interpolation axis control

360 + 
720 + 
to
360  n + 
to
360  999 + 
End point
Start point
X axis
Other than true circle
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