Fanuc Parameter 1860 Full !full! Here

Parameter 1860: Reference Point Return Speed (High-Speed "G28" Approach)

1. Overview

• Function: Sets the rapid traverse rate (mm/min or inch/min) for the second stage of a reference point return operation (G28).
• Control Type: Used on FANUC Series 0i, 16i, 18i, 21i, 30i, 31i, 32i and similar models.
• Axis Association: Separate parameter per axis (e.g., 1860 for 1st axis, 1861 for 2nd axis, etc.).
• Units: Depends on the machine’s input increment system (metric: mm/min; inch: 0.1 inch/min).

Professional Recommendations

1. Never use Parameter 1860 to compensate for tool wear. Use tool offsets (Geometry/Wear).
2. Keep a printed log of original parameter values inside the electrical cabinet.
3. Use the "full" range sparingly. Shifting by more than 10 mm suggests a mechanical or setup problem.
4. For critical applications (aerospace, medical), after changing 1860, run a verification program that checks zero position with a probe or dial indicator.
5. When in doubt, call Fanuc or your machine builder. A remote service call costs $200; a spindle crash costs $20,000.

Fanuc Parameter 1860 (Position of the absolute position detector) is a read-only parameter that displays the current position value from the absolute pulse coder. While it is not a setting you typically edit manually, it serves as a critical reference point for the CNC system to maintain axis alignment without needing to re-home after a power cycle. Key Characteristics and Function Data Type: 4-word (integer).

Step-by-Step: How to View and Modify Parameter 1860

WARNING: Changing Parameter 1860 will immediately change your machine's zero point. If done incorrectly, the turret or table can crash into the chuck or column. Never change this parameter without first establishing a "Soft Limit" or verifying clearance. fanuc parameter 1860 full

How It Works (Simplified Control Loop)

1. CNC Calculates Command: The control determines a target velocity for the axis.
2. Smoothing via 1860: Instead of applying the full velocity command instantly (which would cause a mechanical jerk), the CNC feeds the command through an exponential acceleration/deceleration filter. The time constant (1860) defines how long it takes to reach approximately 63.2% of the target speed.
3. Velocity Command to Servo: The smoothed command is sent to the servo amplifier.
4. Motor Response: The motor accelerates according to the defined curve.

• Machine capability and condition
• Workpiece material and geometry
• Tooling and cutting conditions
• Desired machining performance

$$ \textDetection Unit = \frac\textScrew Pitch \times \textGear Ratio\textMotor Revs per Pulse \times 1821 $$ Function: Sets the rapid traverse rate (mm/min or