Fanuc — Parameter 1860 Full ((link))

Ensure the encoder is properly homed before assuming the parameter is wrong.

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.

| Axis Type | Ball Screw Pitch | Detection Unit | Reference Counter | FFG Ratio (2084/2085) | |---|---|---|---|---| | Linear (X) | 10 mm | 1 μm | 10,000 | 1/100 | | Linear (Z) | 12 mm | 1 μm | 12,000 | 3/250 | | Rotary | 1:10 ratio | 1/1000° | 36,000 | 9/250 |

: Vertical mill with βiA encoder (8000 pulses/rev). Parameter 1820 = 8000 (no division). 1860 should be = 8000 ÷ 8000 = 1.

The screen will display Parameter 1860 with separate columns for each axis (X, Y, Z, etc.). Step 3: Edit and Input the Value fanuc parameter 1860 full

However, if you set Parameter 1860 to a low value (e.g., 100 mm/min), you force the machine to slow down significantly during feedrate changes. This creates a "soft start" effect that reduces mechanical stress on the servo motors during heavy cuts, but it often causes or "dogs" in the part profile because the machine physically cannot accelerate out of the corner fast enough.

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If the axis continuously adds up degrees (e.g., 1000°, 1010°) instead of resetting. 3. How to Set Fanuc Parameter 1860 Full (Steps)

DS0300 Alarm (APZ = 0).

After rebooting, set PARAMETER WRITE back to 0 and press RESET to clear the alarm. Pro-Tip: The Grid Shift Limit

Parameter 1860 (X) = 3000 mm/min

This comprehensive technical guide outlines everything an engineer, maintenance technician, or CNC operator needs to know about Fanuc Parameter 1860, its companion parameters, and how to safely navigate it during repairs. Technical Overview of Parameter 1860

On long-travel axes (e.g. 4m+ gantry), the inertia may cause the axis to overshoot the deceleration zone. If the grid point falls beyond the P1860 window, an alarm triggers. Increasing P1860 resolves this. Ensure the encoder is properly homed before assuming

Always backup your parameters before changing them. Improper settings can lead to unexpected machine movement. Enable Parameter Write: Press the [SETTING] key. Set PARAMETER WRITE=1 .

It defines the amount of offset added to the velocity command immediately following a reversal in axis direction to compensate for mechanical backlash. Typical Setting Range: 20 to 600. Related Parameters:

During heavy roughing with large cutter engagement, use a . This provides a "soft start" that prevents the tool from digging in or chipping at corner entries. Some advanced operators even program a macro to change 1860 dynamically via a G10 command based on tool type.