Fanuc Parameter 1860 Full Fix -

$$ 1860 = \frac\textGear Ratio (Motor to Ball Screw) \times \textReference Counter (1821)\textFeed Gear Ratio $$

While overlooked by many, Parameter 1860 is key to the machine's "memory" of where it is in space. This guide explains what this parameter does, its different functions in various FANUC systems, and the correct procedures for setting it up to ensure your machine establishes its reference points quickly and consistently.

: If the backup battery for the absolute pulse coder dies, causing the machine to lose its zero position. fanuc parameter 1860 full

For a broader overview of Fanuc parameters, you can review the official FANUC 0i Series Parameter Manual.

| 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 | $$ 1860 = \frac\textGear Ratio (Motor to Ball

If you encounter a "300 APC Alarm: Need ZRN" (Zero Return Needed), typically caused by a dead battery, you must re-establish the relationship between the physical machine and the encoder data. How to Enable Parameter Write Enable (PWE) on a Fanuc CNC

Parameter 1860 and Parameter 1825 (position loop gain) work in tandem. If you increase 1825 for higher stiffness, you may need to decrease 1860 to avoid instability. Conversely, a low 1825 with a very low 1860 will cause overshoot. For a broader overview of Fanuc parameters, you

: Value 1 for the zero point of the absolute position detector

is a critical axis-specific setting used to store and display the current position data of an absolute position detector (encoder). Parameter Definition Parameter Number : Absolute position detector current position data. : 4-word (integer).

: During a reference position establishment sequence (such as after replacing backup batteries or an encoder), the CNC calculates the offset between the encoder's hardware zero grid and the physical machine reference position.