On machines with tandem axes (two motors driving one large gantry), a discrepancy in Parameter 1860 between the master and slave axis will cause an immediate twist alarm or excessive current draw. Ensure both axes mirror the same calculation unless their physical gearing differs.
: Acts as the master calibration offset following an Absolute Pulse Coder (APC) battery replacement or a physical encoder decoupling.
However, if you set Parameter 1860 to a low value (e.g., 100 mm/min), you force the machine to slow down significantly during feedrate changes. This creates a "soft start" effect that reduces mechanical stress on the servo motors during heavy cuts, but it often causes or "dogs" in the part profile because the machine physically cannot accelerate out of the corner fast enough.
Must be set to use specialized backlash compensation. Parameter 1851: Backlash compensation amount (low speed). Parameter 1852: Backlash compensation amount (high speed). fanuc parameter 1860 full
This parameter stores the absolute position of the machine's axes relative to the machine zero point. It is primarily relevant for machines equipped with absolute encoders, where the position must be retained even after the power is turned off.
References: Fanuc 0i-D, 0i-F, 31i-B5 Series Connection Manual (B-64643EN) and Parameter Manual (B-64640EN). Always consult your specific machine tool builder's documentation as they may override standard Fanuc recommendations with custom PMC logic or secondary parameters.
The reference position is established . The system knows exactly where the axis is located based on the absolute encoder data. 2. When Does Parameter 1860 Revert to 0? On machines with tandem axes (two motors driving
If you have altered Parameter 1860 and encounter issues, check for these common mistakes:
, cycle power, move to the physical home, and set it back to
In FANUC CNC systems (such as Series 16i/18i/21i and 0i), Parameter 1860 However, if you set Parameter 1860 to a low value (e
The machine cuts perfect straight lines but oval arcs. This is often a mismatch between 1860 and the acceleration for the orthogonal axes. Ensure that the 1860 values for X and Y (or X and Z) are identical for circular moves. Uneven acceleration distorts circles into ellipses.
Turn back to 0 and press RESET to clear any remaining layout flags. Troubleshooting Parameter 1860 Discrepancies Probable Cause Corrective Action Parameter 1860 shows 0