Fanuc Parameter 1860

Fanuc parameter 1860 is used within the servo parameters of Fanuc 16/18/21 (and later) controls, specifically relating to backlash compensation.

• Leave at OEM default unless you have a clear need to change it.
• If you need lower spindle speeds for a special operation, consult the spindle motor/drive documentation and test incrementally.
• Never set the parameter lower than the spindle/drive’s guaranteed stable torque speed.

9. Safety and Best Practices

• Never set 1860 to zero – The axis will not move during reference return.
• Document original values before changing. Back up parameters via RS-232 or memory card.
• Test without tools or workpieces first. An unexpected fast homing could crash a tool into a fixture.
• Use a consistent procedure when tuning—environmental temperature affects limit switch repeatability, which interacts with 1860.
• If the machine has multiple reference positions (e.g., G30 2nd reference), Parameter 1860 applies only to G28 (1st reference). Separate parameters (1861, 1862) control other reference return speeds.

Q2: Does 1860 affect normal spindle speed (Sxxxx) operation?
A: No. 1860 only applies to orientation mode (position control). Speed control remains unaffected. fanuc parameter 1860

• Press the SYSTEM key.
• Type 1860 and press [SEARCH].

In the FANUC control system, Parameter 1860 (often referred to as a critical bit-type parameter used to indicate whether the absolute position of an axis has been established Core Function: Absolute Position Zero (APZ) Parameter 1860 is an Axis Parameter Fanuc parameter 1860 is used within the servo

5. Setting Up Parameter 1860: Step-by-Step Procedure

Prerequisites

• Machine is powered on, emergency stop released.
• Know axis rapid speed (Parameter 1420) and maximum feedrate (1430).
• Know dog length (typically 20-50 mm for linear axes).

2. Parameter Format and Units

Basic Specification

• Parameter Number: 1860
• Axis Association: Separate value for each controlled axis (up to 8 axes, typically).
• Data Type: Real number (decimal) or integer, depending on control model and setup.
• Unit: Millimeters per minute (mm/min), inches per minute (in/min), or degrees per minute (for rotary axes).
• Default Value: Machine tool builder dependent, but often 300 mm/min or 12 ipm.
• Valid Range: 6 mm/min to 15,000 mm/min (or equivalent in inch/rotary units), subject to maximum feedrate clamp (Parameter 1430).

• You have the correct documentation for your specific FANUC CNC system and I/O device.
• You understand the I/O device's configuration and communication requirements.
• You set the correct value to avoid any potential communication errors or system malfunction.