6. Interpolation Functions
6.14 3-dimensional Circular Interpolation; G02.4, G03.4
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When liner interpolation is applied
In the following case, liner interpolation but 3-dimensional circular interpolation is applied.
(1) When the start point, intermediate point, and end point are on the same line (refer to the
following figure)
(If the end point exists between the start point and intermediate point, axes move in the order
of start point, intermediate point, and end point.)
(2) When two points match in start point, a intermediate point, end point
(Liner interpolation is applied even if the end point matches the start point to command true
circle. When the start point matches the end point, axes move in order of the start point, an
intermediate point, and an end point.)
• When liner interpolation is applied
Start point
(Current position)
Intermediate point
(Block1)
End point
(Block2)
When the three points are on the same line, liner interpolation is applied.
Start point
(Current position)
End point
(Block2)
Intermediate point
(Block1)
Even if the end point exists between the start point and intermediate point, move
in the order of start point, intermediate point, and end point.
Modal command
The 3-dimensional circular interpolation command G02.4 (G03.4) is a modal command belonging
to 01 group. The command will remain valid until the other G command in the 01 group is issued.
When the 3-dimensional circular interpolation command is carried out continuously, the end point
of present command is the start point of next command.
Precautions
(1) If single block is valid and this command is operated, a block stop is carried out at an
intermediate point and the end point.
(2) The speed command during 3-dimensional circular interpolation is the tangential speed on
arc.
(3) When 3-dimensional circular interpolation is commanded while incremental command is valid,
the relative position of the intermediate point in respect to the start point is designated in the
intermediate point designation block, and the relative position of the end point in respect to the
intermediate point is designated in the intermediate point designation block.
(4) The path of 3-dimentional circular interpolation during graphic check is drawn as linear at each
range from start point to intermediate point and from intermediate point to end point.