fanuc parameter 1860 full

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Technical Write-Up: FANUC Parameter No. 1860 (Reference Position Check)

4. Practical Setting Guidelines

| Machine Type | Typical 1860 Value (mm/min) | Reason | |--------------|-----------------------------|--------| | Small milling | 500 – 2000 | Short deceleration zone, slower dog approach | | Large lathe | 2000 – 6000 | Heavy axis, needs consistent dog capture | | High-speed machining center | 1000 – 4000 | Balanced speed vs. repeatability | | Grinder | 200 – 1000 | Very fine reference accuracy required |

  • Rule of thumb:
    Set 1860 to approximately 10–30% of the axis rapid rate (1420).
    Example: If rapid = 20,000 mm/min → 1860 = 2000–6000 mm/min.

1. Replacing a Dead Battery or Absolute Encoder

If the absolute encoder battery dies, the machine loses its zero position. After replacing the battery, you must re-establish machine zero. Parameter 1860 allows you to "tell" the control where the new zero is relative to the mechanical hard stops. fanuc parameter 1860 full

6. Troubleshooting & Adjustment Procedure

WARNING: Changing servo parameters can cause axis runaways or crashes. Clear the machine work zone and be prepared to hit E-STOP immediately. Technical Write-Up: FANUC Parameter No

Key Characteristics:

  • Axis-Specific: A separate 1860 exists for each controlled axis (e.g., 1860 for X, 1861 for Y, 1862 for Z, etc.).
  • Unit of Measure: Milliseconds (ms). Typical values range from 20 to 500 ms depending on machine size and rigidity.
  • Application: Active only during cutting feedrates (F-code moves). Does not affect rapid traverse (G00)—those are controlled by parameter 1620 and 1622/1624.

What is Fanuc Parameter 1860? A Technical Definition

Fanuc Parameter 1860 is a servo parameter that sets the time constant (in milliseconds) for the first-order lag filter applied to the velocity command during cutting feed (G01, G02, G03) operations. Rule of thumb: Set 1860 to approximately 10–30%

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.

What Does Parameter 1860 Do?

In semi-closed loop systems, the CNC counts feedback pulses from the motor encoder to determine position. When returning to a reference point (grid method), the reference counter counts pulses from a grid signal until it reaches the value set in 1860, then generates the reference point.

In simpler terms:

  • 1860 = Number of reference pulses per motor revolution ÷ (Divider ratio set in Parameter 1820).
  • It determines how many feedback pulses correspond to one full revolution of the motor after electronic gear calculation.