4. INTERPOLATION FUNCTIONS
Either of two types of machining can be selected, depending on the
D For those portions where the accuracy of the figure is critical, such as
at corners, machining is performed exactly as specified by the program
D For those portions having a large radius of curvature where a smooth
figure must becreated, points along the machining path are
interpolated with a smooth curve, calculated from the polygonal lines
specified with the program command (smooth interpolation).
Smooth interpolation can be specified when CDSP (bit 5 of parameter No.
8485) is set to 1 in high–speed contour control mode (between G05
P10000 and G05 P0). Smooth interpolation performed in high–speed
contour control mode is described below. For details of high–speed
contour control, see Section 20.5.
Starting of smooth interpolation mode
Cancelation of smooth interpolation mode
G05.1 Q 0;
To machine a part having sculptured surfaces, such as metal moldings
used in automobiles and airplanes, a part program usually approximates
the sculptured surfaces with minute line segments. As shown in the
following figure, a sculptured curve is normally approximated using line
segments with a tolerance of about 10 m.
: Specified point
D Characteristics of