This parameter stores the absolute position of the machine's axes relative to the machine zero point. It is primarily relevant for machines equipped with absolute encoders, where the position must be retained even after the power is turned off.
: It records the current position of each axis relative to the reference point.
amount while it's supposed to be stopped, shut the machine down for safety."
Knowing these details will allow for more targeted troubleshooting advice. Share public link fanuc parameter 1860 full
In Fanuc CNC systems (Series 16i/18i/21i and 0i-MODEL B/C/D/F), Parameter 1860 current position of the Absolute Pulse Coder (APC) at the reference position. While parameter is used to tell the control "where" home is, parameter
: Stores the APC counter value when the axis is at the reference point. Relationship to 1861 : Because APC values can be very large, parameter
It is part of the servo backlash compensation system. Its primary purpose is to address or "blips" that occur when a machine axis reverses direction. When an axis moves from a negative to a positive direction (or vice versa), there is a momentary loss of control due to mechanical gaps (backlash). Parameter 1860 provides a quick burst of acceleration during this reversal to bridge that gap instantly, minimizing the protrusion in the machined workpiece. Key Details: Parameter Number: 1860 Function: Stage 1 Backlash Acceleration Amount (%) Unit of Data: Percentage (%) This parameter stores the absolute position of the
: Acts as the master calibration offset following an Absolute Pulse Coder (APC) battery replacement or a physical encoder decoupling.
What is the (e.g., 0i-MD, 18i-TB)? What specific alarm number are you seeing?
When a CNC machine executes a rapid traverse command, the CNC command generator calculates where the axis should be at any given millisecond. The servo motor tries to keep up with this command. The physical distance between where the machine should be and where it actually is is called the position deviation. Parameter 1860 dictates exactly how much deviation the system will tolerate at high speeds before triggering an emergency shutdown. The Functional Role of Parameter 1860 amount while it's supposed to be stopped, shut
The value entered into Parameter 1860 is measured in the system’s minimum detection units, which depend on your machine's feedback loop setup (increments of the encoder).
A common mistake made by technicians attempting to shift an axis home position (e.g., trying to adjust a Z-axis tool change height) is typing a new number directly into Parameter 1860.
However, Parameter 1860 specifically interacts with the (Parameter 1821). In standard configurations (using Semi-Closed Loop control with standard encoders), Parameter 1860 is often set to 2 or calculated based on the Gear Ratio.
Whether the axis uses a or just the motor encoder Any alarm codes currently showing on the screen Share public link
According to the Fanuc Servo Motor Parameter Manual, the default or optimal values generally range between . Default Setting: 50% Recommended Starting Point: 30% - 50% Too Low: Protrusion (a small "blip" on the part) Too High: Gouge (a small indentation on the part)