1860 Full [hot] | Fanuc Parameter
In FANUC CNC systems (such as Series 16i/18i/21i and 0i), Parameter 1860
- The axis moves rapidly toward the deceleration dog.
- After hitting the dog, it decelerates to a slow speed (FL speed).
- It continues until the deceleration signal turns OFF, then searches for the first grid point (encoder marker pulse).
- Parameter 1860 sets the maximum allowable distance from the deceleration signal OFF point to the grid point.
Technical Report: FANUC Parameter 1860 (Axis Movement Pulse)
Subject: Configuration, Function, and Troubleshooting of Parameter 1860 Applicable Systems: FANUC Series 16i, 18i, 21i, 30i, 31i, 32i, 0i-TD/TF, 0i-MD/MF Category: Servo Initialization / Axis Setting fanuc parameter 1860 full
Step 2: Navigate to Parameter 1860
- Press SYSTEM again.
- Ensure you are on the PARAMETER screen.
- Type 1860 and press the [NO.SRH] (Number Search) soft key.
Common Troubleshooting Scenarios Involving 1860
Scenario 1: New Servo Motor or Rebuild
After replacing a servo motor or ballscrew, the machine shakes during G01 moves. Fix: The new components have different inertia. Calculate the new inertia ratio (parameter 2047/2048) first, then reduce 1860 by 20% as a starting point, then fine-tune upward. In FANUC CNC systems (such as Series 16i/18i/21i
Need help calculating the exact shift value for your specific axis? How to Enable Parameter Write Enable (PWE) on a Fanuc CNC The axis moves rapidly toward the deceleration dog
- Axis X rapid (1420) = 30,000 mm/min
- Dog length = 20 mm
- Desired repeatability = ±0.002 mm
- Positive Value (+): The zero point shifts in the positive direction (tool moves away from the spindle/chuck).
- Negative Value (-): The zero point shifts in the negative direction (tool moves toward the spindle/chuck).
Keep in mind that incorrect parameter settings can lead to machine malfunction or safety issues. Always consult the FANUC documentation and/or contact a qualified FANUC technician if you're unsure about setting parameters.