num parameter manual - Documentation CN

6.21 Setting for Very High Speed Machining
Speed
reference Ri
6 - 46 en-938818/7
Corrector
Smoothed
+
speed +
+
reference Ri'
Filter DAC
Actions
Set the speed anticipation to 100 percent, proceeding as follows:
Set the same gain on the all the axes.
Calculate the time constants and enter them in P56 (See 6.7).
-
Measurement
Adjust the acceleration anticipation using the Ball-Bar trace to have the real circle as close as possible to the theoretical
circle. The check can be made on a circle with a radius of 20 mm at a speed of 3 m/min. It is advisable to check that
the trace remains acceptable at higher or lower speeds.
The acceleration anticipation can be accurately set in P19 (See 6.14) dynamically by the Ball-Bar part programme.
The overshoot due to cycle hold action during execution of the circle generated by the Ball-Bar programme allows the
number of filtered terms to be adjusted as accurately as possible (words N8 to N15 of P55 (See 6.11)).
Example of Use of the Ball-Bar Programme
Create a part programme.
% 1020
M997 G77 H9997.9
G80
REMARK: Programme %9997.9 is a firmware macro.
Preset P19 and P55.
Programme function G120 in MDI mode followed by the interpolation
plane, the direction of rotation of the circle, the radius and the speed
(e.g. G120 G18 G3 R.. F..).
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