
B-65270EN/05 APPENDIX H.DETAILS OF HIGH-SPEED AND HIGH-PRECISION ADJUSTMENT
- 501 -
[Guideline for setting]
For the parameter number, refer to the parameter manual of each
CNC.
Small machines with a high rigidity: F400
Medium-size or small machining centers with a relatively high
rigidity: F300
Large machines: F200
[Actual adjustment procedure]
Execute the following program, and measure the actual path.
G91;
G08P1;
G01X10.F4000;
G01Y-20.;
G01X-20.;
G01Y20.;
G01X10.;
G08P0;
G04X3.;
M99;
Start and end point
Corner 1
Corner 2
Corner 3
Corner 4
Fig. H (p) Programmed figure
The XY mode (Ctrl-X) is used for drawing. To observe an overshoot
along an axis to be stopped, the figure is enlarged in the direction of
the axis to be stopped. Corner 1 and corner 3 in Fig. H (p) are
enlarged in the X-axis direction, and corner 2 and corner 4 are
enlarged in the Y-axis direction. In the examples below, corner 1 is
displayed using 0.01 mm/div in the X-axis direction and 0.1 mm/div
in the Y-axis direction.
In Fig. H (q) where a reduced corner feedrate of F1000 is set, an
overshoot of 10 µm or more has occurred. In Fig. H (r), however, the
overshoot is reduced to about 3 µm.
If an overshoot cannot be removed by setting a reduced corner
feedrate close to 0, the acceleration of acc./dec. before interpolation
may be too large. In such a case, set a longer time for acc./dec. before
interpolation. (In this case, a longer machining time results.)
Fig. H (s) shows the feedrate along the X-axis and Y-axis (corner 1)
when the corner deceleration function is used.