Write the final 1860. Power cycle the CNC (some controls require restart). Re-home and verify repeatability.
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). fanuc parameter 1860
If 1860 is set equal to or higher than the rapid speed of that axis, the control will not decelerate properly. The axis may overshoot the dog, fail to find the marker, and trigger alarm PS0090 (Reference return incomplete) or PS0091 (Zero point not found). Write the final 1860