13. Program Support Functions
13.18 Spline; G05.1
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When the above conditions are satisfied, the spline curve will be revised so that the error
between P2-P3 in Fig. 4 is within the designated value.
P1
P2
P3
P4
P5
Spline curve
Tolerance (chord error)
Fine segment
Fig. 3 Spline curve before error revision
P1
P2
P3
P4
P5
Spline curve after revision
Spline curve before
revision
Chord error designation parameter
"Toler-2"
Fig. 4 Spline curve after error revision
In parameter "Toler-2", set the tolerance for developing into fine segments with the CAM.
(3) Curvature speed clamp
The commanded speed F for the spline function during a segment linear arc will be the speed
commanded in the previously set modal. However, if the axis is fed with the same speed,
excessive acceleration may occur at the sections where the curvature is large (where
curvature radius is small) as shown below. Thus, the speed clamp will be applied.
F
F
Curvature small
Acceleration small
Acceleration large
Curvature large
F: Commanded speed (mm/min)
Acceleration and curvature