Fanuc Parameter 1860 Full New! ✭ 〈FAST〉

In the vast ecosystem of FANUC CNC parameters, certain numbers are famous for simple functions like handwheel feed rates (No. 1430), while others are infamous for their mystery. Parameter 1860 belongs firmly in the second category. Search any FANUC forum, and you will find a trail of confused engineers wondering why their machine lost zero, what the difference is between 1860 and 1861, or why a "Backlash Acceleration" setting is suddenly breaking their rotary axis alignment.

If issues arise after setting parameter 1860, consider the following:

This controls how fast that compensation is applied. 6. Troubleshooting 1860

Tuning this parameter requires a testing process to ensure the backlash compensation is optimized for your machine's specific friction characteristics. Procedure for Testing: fanuc parameter 1860 full

Repeat the cut and measurement until the quadrant mark is minimized. 5. Related Parameters and Prerequisites

After replacing a servo motor or ballscrew, the machine shakes during G01 moves. The new components have different inertia. Calculate the new inertia ratio (parameter 2047/2048) first, then reduce 1860 by 20% as a starting point, then fine-tune upward.

According to the Fanuc Servo Motor Parameter Manual, the default or optimal values generally range between . Default Setting: 50% Recommended Starting Point: 30% - 50% Too Low: Protrusion (a small "blip" on the part) Too High: Gouge (a small indentation on the part) In the vast ecosystem of FANUC CNC parameters,

If you see a : Decrease the value in parameter 1860 by 5-10%.

: A common error associated with this parameter is "Alarm 309: Reference Return Impossible," which typically occurs if you attempt to set the reference position (APZ bit in 1815) before the system has properly recognized the encoder data or if there is a mismatch with Parameter 1860. Homing After Battery Swap

| Parameter | Function | Interaction | |-----------|----------|-------------| | | Rapid traverse (G00) | Must be ≥ 1860 in value | | 1850 | Grid shift | Fine reference point offset; 1860 affects grid capture reliability | | 3001 | Reference point deceleration signal (dog length) | If dog is short, 1860 must be lowered | | 1826 | Position coder 1-revolution signal check speed | Must be higher than 1860 to detect reference mark | Search any FANUC forum, and you will find

You will typically need to check or modify parameter 1860 during the following scenarios:

Standard incremental encoders require the machine to execute a manual reference return sequence (homing) at every startup to locate the physical grid pattern. By contrast, systems equipped with FANUC Absolute Pulse Coders (APCs) retain their physical position context via battery-backed memory even when the primary power is disconnected. Fanuc 1815 Parameter Overview | PDF - Scribd