Fanuc Parameter 1860 ((hot)) Now
Modifying axis parameters like 1860 can cause the machine to lose its physical orientation. To prevent crashes: Enable Parameter Write (PWE)
: Navigate to the OFFSET / SETTING function screen, open the SETTING (HANDY) page, and change PARAMETER WRITE (PWE) from 0 to 1 . Ignore the 100 ALARM that safely warns you that editing is open.
On milling machines with rigid tapping, the spindle must behave as a precise rotary axis synchronized with the Z-axis feed. Parameter 1860 influences how quickly and accurately the spindle settles at the reversal point (top of thread) before reversing rotation. For lathes with live tooling and C-axis, Parameter 1860 affects the indexing accuracy for milling or drilling off-center holes.
On certain FANUC control models such as the Series 0i-MC, parameter 1860 serves a completely different purpose related to the . fanuc parameter 1860
During a linear move, an axis moves smoothly under the control of the position and velocity loops. However, when an axis changes direction (e.g., from positive X to negative X), it must come to a stop and accelerate in the opposite direction.
No, parameter 1860 is not available on all FANUC control models, and its function varies significantly among models that do support it. Always verify applicability and function with the official FANUC documentation for your specific control.
| Control Series | Data Format | Minimum Unit | Typical Range (Linear) | |----------------|-------------|--------------|------------------------| | | Integer (mm/min) | 1 mm/min | 100 – 600 | | 16i/18i/21i | Integer | 1 mm/min | 200 – 800 | | 30i/31i/32i-B | Real (decimal) | 0.001 mm/min | 200.000 – 800.000 | | Power Motion i | Real (mm/min) | 0.001 mm/min | 100 – 1000 | Modifying axis parameters like 1860 can cause the
(often used in conjunction with 1861) dictates the behavior of the reference position update for a rotary axis. It is primarily found in FANUC Series 16i-B, 18i-B, 160i-B, and 180i-B parameter manuals .
On FANUC CNC controls (such as the Series 0i, 16i, 18i, 21i, and 30i/31i/32i models), defines the Grid Position Shift Amount for each axis.
Functions similarly on older or specific FANUC models to enable absolute position detection. On milling machines with rigid tapping, the spindle
In FANUC troubleshooting, Parameter 1860 is rarely discussed without mentioning . They work hand-in-hand to manage absolute positioning.
| Problem | Likely Cause | Solution | |---------|--------------|----------| | Alarm PS0090 after G28 | 1860 too high → missed marker pulse | Reduce 1860 by 50% and retest. | | Intermittent home position shift (5-20 microns) | 1860 borderline high + electrical noise | Lower 1860; also check encoder cable shielding. | | Axis overtravels immediately after dog detection | 1860 higher than rapid speed (1420) | Set 1860 < 1420. | | Rotary axis homes inconsistently | 1860 too high for rotary inertia | Reduce 1860; consider increasing deceleration time (Parameter 1620). | | Homing takes >5 seconds | 1860 too low | Increase 1860 (test stability first). |
By mastering Fanuc parameter 1860 and other CNC-related topics, you can take your machining skills to the next level and achieve exceptional results.