Fanuc Parameter 1860 ((link)) Full [BEST]

| Encoder Type | Reference Pulses/Rev | Typical 1820 | Calculated 1860 | |--------------|----------------------|--------------|------------------| | αiA 4096 P/rev | 4096 | 4096 | 1 | | αiB 16384 P/rev | 16384 | 16384 | 1 | | αiCZ 10000 P/rev | 10000 | 10000 | 1 | | βiA 8000 P/rev | 8000 | 8000 | 1 |

If you are working with a rotary axis (A type) that uses a rotary scale without revolution data (such as certain Heidenhain or Futaba scales), the logic changes. Here, Parameter 1860 is linked to Bit 1815 (RONx).

A 4th or 5th axis rotary table has high inertia. Setting 1860 too low on the rotary axis will cause "clunking" on start/stop. For a rotary axis, start with 1860 = 150 ms. Increase until motion is smooth, even if it slows indexing. fanuc parameter 1860 full

When executing a coordinate calibration or recovering from an absolute pulse coder battery failure, Parameter 1860 bridges the gap between the machine's absolute electrical grid and its actual physical alignment. Parameter Technical Overview : 1860 Data Type : Two-word axis (Long Integer) Valid Range : -99999999 to 99999999 Default Value : 0

If the distance measured during the actual return exceeds the value set in P1860, an alarm (typically – "Reference position return incomplete" or SV0413 – "Excessive grid shift") may occur. | Encoder Type | Reference Pulses/Rev | Typical

. If the axis has dropped (e.g., a Z-axis droop during emergency stop), this value may reflect that physical shift even if the machine's relative position display was reset. Key Related Parameters

Fanuc Parameter 1860 is not a "set and forget" value. It is a dynamic tuning lever that balances the competing demands of (cycle time), accuracy (corner fidelity), and stability (vibration-free cutting). Setting 1860 too low on the rotary axis

Never set Parameter 1860 to 0 or an extremely high value as a "fix" for a mechanical problem. This disables a vital safety check and can lead to machine crashes or damage to the ball screws.