On vertical (Z) axes, the brake might be slipping or the counterbalance (if equipped) might be failing, causing the axis to drop slightly when the motor stops.
Sudden jumps or inconsistent "wrap-around" behavior in this parameter can signal a failing encoder or noise in the communication line between the motor and the CNC control . Safety and Modification fanuc parameter 1860 full
Defines the allowable error while the axis is in motion . This is usually a large value (e.g., 5000+ units) because lag is expected during high-speed movement. On vertical (Z) axes, the brake might be
Absolute encoders rely on a backup battery to "remember" their position when the power is off. If the battery dies, the position is lost. This is usually a large value (e
Are you experiencing a specific or axis shift that led you to check this parameter? FANUC? M6 toolchange position. | Practical Machinist