HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 574)

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Machine parameters for C axes
807, 857, .. Measuring the angle offset (G906) for spindle
Evaluation: G906 Measuring angular offset during spindle synchronization
„ Maximum permissible change in position: Tolerance window for the change of position offset after the
spindles have gripped the workpiece at both ends during synchronized operation. If the offset change
exceeds the maximum value, an error message appears. A normal fluctuation of approx. 0.5° must be
considered.
„ Waiting time, measuring offset: Measuring period (duration)
808, 858, .. Parting control (G991) for spindle
Evaluation: G991 Controlled parting using spindle monitoring
After the parting operation has been completed, the phase angle of the two synchronized spindles changes
without the nominal values (speed/angle of rotation) being changed. If the speed difference is exceeded during
the monitoring time, the workpiece is considered as being cut off.
„ Speed difference
„ Monitoring time
809, 859, .. Load monitoring for spindle
Evaluation: Load monitoring
„ Start-up time for monitoring [0..1000 ms]: The load monitoring function is not activated if the nominal
acceleration of the spindle exceeds the limit value (limit value = 15% of acceleration ramp / brake ramp). As
soon as nominal acceleration falls below the limit value, the monitoring function is activated after the start-up
time for monitoring has elapsed.
The parameter is only evaluated if “Omit paths of rapid traverse” is active.
„ Number of measured values to be averaged [1..50]: The mean value is calculated from the number of
values to be averaged. This reduces the sensitivity to short-term peak load during monitoring.
„ Reaction delay time P1, P2 [0..1000 ms]: The system reports a limit violation as soon as the delay time for
P1 or P2 (limit torque 1 or 2) has been exceeded.
„ Maximum torque is not used at present.
Spindle parameters
Parameters for C axes
1007, 1057, .. Backlash compensation in C axis
During each change in direction, the nominal value is corrected by the value entered in the “Backlash
compensation value” option.
„ Type of backlash compensation
„ 0: No backlash compensation
„ 1: During a change in direction, the value of the backlash compensation is added.
„ Value of backlash compensation