Fanuc Parameter 1860 [verified] May 2026

Post: Fanuc Parameter 1860 — What it is and how to use it

reset a home position

Are you currently trying to after a battery change or motor replacement? FANUC? M6 toolchange position. | Practical Machinist

The Ghost in the Gear Train

Alarm 300:

Request for zero return (the system has lost its position). fanuc parameter 1860

Rapid (1420): 20,000 mm/min
1860 set to 300 mm/min → Homing time: ~0.5 sec after dog detection
1860 set to 50 mm/min → Homing time: ~3 sec (wasted 2.5 sec per cycle × 1000 cycles = 41 minutes lost per year)

In the world of FANUC CNC systems, Parameter 1860 is a critical, though often misunderstood, data field that serves as the digital link between the machine's physical location and its internal coordinate system. For technicians and engineers, mastering this parameter is essential for maintaining the high-precision "memory" of a machine tool. The Role of Absolute Position Detectors Post: Fanuc Parameter 1860 — What it is

Battery Replacement:

If the backup battery for the absolute pulsecoder dies while the power is off, the absolute position is lost. You must re-establish the home position. Rapid (1420): 20,000 mm/min 1860 set to 300