Detection units (typically millimeters or inches, scaled by the machine's increment system—often 0.001mm or 0.0001 inches).
When a CNC axis is in motion, there is always a slight delay between the commanded position from the CNC and the actual physical position of the servo motor. This lag is known as or following error . Parameter 1829 sets the maximum allowable threshold for this error while the axis is actively moving.
In a closed-loop system, the CNC tells the drive to hold a specific coordinate. The drive monitors the actual position via encoder feedback. The difference between where it be and where it fanuc parameter 1829
In FANUC CNC systems (such as the 0i-D, 0i-F, 16i/18i/21i, and 31i series), defines the Position Loop Gain for the reference position setting (often designated as loop gain for the 1st reference position or rigid tapping).
is a critical axis control setting that defines the positioning deviation limit while an axis is stopped . It acts as a safety threshold for the CNC system, monitoring the "lag" or "error" between where the control thinks the axis should be and where it actually is while at a standstill. Detection units (typically millimeters or inches, scaled by
On vertical axes, if the motor brake is slipping, gravity pulls the axis down, causing the deviation to spike above the 1829 limit. Servo Tuning:
If the value in Parameter 1829 is set too high, the loop gain is overly aggressive. The axis will overcorrect, shoot past its target, pull back, and overshoot again. This causes a high-frequency vibration or audible humming when the axis approaches its reference point. 3. Poor Rigid Tapping Thread Quality Parameter 1829 sets the maximum allowable threshold for
In a Fanuc CNC system, the difference between the commanded position and the actual position is called "following error" or "positional deviation".