Fanuc Parameter 1860 Full ((top)) -

is a highly critical, system-controlled axis parameter that dictates the Zero Point Value for the Absolute Position Detector (Absolute Pulse Coder) . In the world of CNC maintenance and engineering, this parameter serves as the literal foundation for a machine’s positioning memory. Without it, a CNC machine utilizing an absolute system would fail to remember its structural orientation upon power cycles, forcing operators to manually re-home the machine every single time it boots.

| Machine Type | Typical 1860 Value (mm/min) | Reason | |--------------|-----------------------------|--------| | Small milling | 500 – 2000 | Short deceleration zone, slower dog approach | | Large lathe | 2000 – 6000 | Heavy axis, needs consistent dog capture | | High-speed machining center | 1000 – 4000 | Balanced speed vs. repeatability | | Grinder | 200 – 1000 | Very fine reference accuracy required |

Parameter 1860 adds a temporary "kick" or acceleration to that compensation move. fanuc parameter 1860 full

-axis home position is reset, the value in 1860 changes, which may require you to re-verify the tool change height stored in Parameter 1241 en.industryarena.com How to View/Set Enable Writing : In MDI mode, go to the screen and set PARAMETER WRITE = 1 : Press the hard key, then the to locate the parameter for each axis.

controls the reference counter size for semi-closed loop axes. A "full" or correct setting ensures one motor revolution corresponds exactly to the counter’s maximum count, providing stable and repeatable reference point return. For most systems, this value is 1 when Parameter 1820 equals the encoder’s reference pulses per revolution. Incorrect values lead to positioning faults and reference point instability. Always verify with machine tool builder documentation before modification. is a highly critical, system-controlled axis parameter that

Some control models include Parameter 1860 as a when a two-speed gearbox is present on the axis drive. This is particularly true for older 18MC controls where parameters 1853, 1855, 1856, 1860, 1861, and 1865 are listed in the same axis format but standard manuals skip to 1870. In those legacy systems, 1860 can store one of the gear ratio numerator/denominator pairs.

: Manually injecting data here can break the logical pairing between the internal encoder counts and physical machine coordinates, potentially triggering axis tracking errors or unexpected overtravel alarms. The Correct Alternative: Parameter 1850 (Grid Shift) | Machine Type | Typical 1860 Value (mm/min)

In FANUC CNC controls, optimizing servo performance and troubleshooting positioning errors requires a deep understanding of the system's parameter structure. Among the critical parameters governing the closed-loop feedback system is .

Modifying CNC parameters can have serious consequences. Follow these guidelines to protect both personnel and equipment.

If the axis continuously adds up degrees (e.g., 1000°, 1010°) instead of resetting. 3. How to Set Fanuc Parameter 1860 Full (Steps)