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When a FANUC CNC system is powered off, the battery-backed absolute position detector continuously tracks motor rotations. During the initialization or remastering of an axis (controlled primarily via —APZ and APC): FANUC? M6 toolchange position. | Practical Machinist
Note: For modern machines with high-quality ball screws and low friction, lower values (20-40%) are often sufficient. 4. How to Tune Parameter 1860
: It acts as the "calibration" value for an absolute encoder. When you perform a zero-return or "homing" procedure on a machine with absolute encoders, the system calculates the difference between the encoder's current reading and the physical home position, then saves this value in Parameter 1860. Automatic Updates : Typically, you do manually enter a value here. When Parameter 1815 fanuc parameter 1860 full
| Machine Type | Rigidity | Typical 1860 Range (ms) | | :--- | :--- | :--- | | Small VMC (BT30) | High | 30–60 | | Large VMC (BT40/BT50) | Medium | 60–120 | | Heavy-duty lathe (X-axis) | Medium | 80–150 | | Gantry mill (heavy slide) | Low | 120–250 | | High-speed machining center | Very High | 10–40 |
In simpler terms, it tells the servo amplifier how quickly to ramp up the motor’s rotational speed (acceleration) or ramp down (deceleration) when the CNC sends a move command while a cutting tool is engaged with the material. When a FANUC CNC system is powered off,
The key to working safely with Parameter 1860 is to , refer to your machine's original documentation , and never assume uniform behavior across different platforms. When in doubt, consult with the machine tool builder or a qualified FANUC service technician before making adjustments.
In FANUC CNC systems (such as Series 16i/18i/21i and 0i), Parameter 1860 | Practical Machinist Note: For modern machines with
: The internal computer calculates the discrepancy between the mechanical "Zero" and the current digital encoder count.
: After significant mechanical work that shifts the physical relationship between the motor and the machine's home position. Accessing the Parameter To view or set this parameter, follow these steps: How to Enable Parameter Write Enable (PWE) on a Fanuc CNC
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.
: Detection Units (Least Command Increments, typically Valid Data Range : -99999999negative 99999999 +99999999positive 99999999 Step-by-Step Parameter Modification Procedure
