Fanuc Parameter 1860 May 2026

Many machinists confuse these two. Here is a simple memory aid:

Never use 1860 to compensate for a misaligned mechanical zero. That is what 1850 is for. Incorrectly raising 1860 to force alignment will only lead to erratic behavior and possible drive failure.

Cause: Spindle cannot reach within the orientation completion width (parameter 1862) due to mechanical binding or incorrect gain. Parameter 1860 might be so low that the spindle never locks. fanuc parameter 1860

Solution: First, ensure mechanical freedom (check belt, bearings, drawbar). Then increase 1860 gradually.

This is the most common reason technicians look up this parameter. If the acceleration is too aggressive for the load on the axis, the servo motor may not be able to keep up with the commanded position. This frequently results in Servo Alarm 410 (Excess Error in Stop) or Servo Alarm 411 (Excess Error in Moving). Many machinists confuse these two

Even with absolute encoders (Parameter 1815#5 = 1), the initial reference position establishment (APZ setting) uses Parameter 1860. After APZ is set, absolute encoders do not use 1860 during power-on, but any manual reference return (holding P and CAN on boot) will.

Write the final 1860. Power cycle the CNC (some controls require restart). Re-home and verify repeatability. Never use 1860 to compensate for a misaligned

Warning: Do not exceed the maximum allowable feedrate of the axis motor/drive. Check motor torque curves. High 1860 on a heavy axis may cause following error (alarm PS0410).

The maximum stable 1860 is the highest speed at which the axis stops within 1-2 encoder counts every time. Back off by 10-15% for margin.

Configuring parameter 1860 involves setting a scaling factor for the feed rate. The parameter is usually a numerical value that represents a percentage of the programmed feed rate. For example, setting parameter 1860 to 100% means the actual feed rate will be the same as the programmed feed rate. Setting it to 50% would halve the feed rate, while 200% would double it.

The specific steps to set parameter 1860 can vary slightly depending on the FANUC CNC system model. Generally, the process involves: