Unlike common mechanical settings like rapid traverse rates ( Parameter 1420 ) or spindle positioning ( Parameter 4077 ), .
: Detection Units (varies based on the machine's configured increment system, typically 0.001 mm or 0.0001 inch). The Architecture: Grid Shift vs. Position Loss
Factory default is almost always 0 . If you see a non-zero value, the machine builder or a previous technician set it.
Without this setting, a machine might display a position of 720° after two full revolutions. With parameter 1860 set, the CNC rounds the coordinate, showing the position relative to the 360-degree circle (e.g., 720° becomes 0° or 360° depending on configuration). Key Related Parameters fanuc parameter 1860 full
Sets the total degree threshold (usually 360.000 degrees) after which a rotary axis wraps its position back to zero. Grid Shift
For servo parameters like 1860 to fully initialize in the servo software loop, turn off the main CNC control power, wait 30 seconds, and turn it back on. Troubleshooting SV0411 Alarms Linked to Parameter 1860
Press the soft key to view the system parameters page. Unlike common mechanical settings like rapid traverse rates
Some operators shift Z-axis zero (Parameter 1860) slightly positive to gain extra clearance for a large drill or boring bar, though this is dangerous and not recommended for production.
Always back up your current Fanuc parameters before making any changes. Improper adjustment of servo parameters can cause poor surface finish or, in extreme cases, servo alarms (e.g., 410 or 420 alarms).
The parameter 1860 for the specific axis (usually Axis 4 or 5) will be shown. Enter 360.000 (or 360000 if your unit requires it). Restart/Power Down: Position Loss Factory default is almost always 0
When you establish a machine's zero point (reference point) after setting Parameter 1815 (APZ/APC), the control calculates the exact relationship between the mechanical position of the axis and the encoder's counter. It then stores this "pairing" data across two parameters:
Press the SYSTEM hard key, then the PARAM soft key. Type 1860 and press NO. SRH .
When you execute G28 X... Y... Z... , the reference point return occurs in :
On many FANUC controls, Parameter 1860 works in conjunction with Parameter 1850 (grid shift) and Parameter 1851 (reference position shift). It determines the range (travel distance) the axis must move to verify that it has correctly reached the machine's reference (home) position after a deceleration signal from the deceleration dog.
Unit conversion: If parameter 1820 = 100 (0.1 µm/unit), then 1000 units = 0.1 mm.