Fanuc Parameter 1860 Full -
When you adjust Parameter 1860, you are not moving the physical limit dog. You are electronically shifting where the control the grid point is.
| Method | When to Use | Risk Level | | :--- | :--- | :--- | | | After replacing a limit switch or deceleration dog. | Medium | | Reference Position Shift (1860) | After replacing absolute encoder or battery. | High | | Work Shift (G54-G59) | Daily part setup. No permanent machine change. | Low | | External Offset | Temporary tool length changes. | Low | fanuc parameter 1860 full
| Parameter | Name | Purpose | | :--- | :--- | :--- | | | Grid Shift (Reference Position) | Shifts the grid point for all reference returns. Used for mechanical dog adjustment. | | 1851 | Grid Shift Fine | Fine adjustment (usually in 1/1000 mm or 1/100000 inch increments). | | 1860 | Reference Position Shift | Shifts the position the machine considers "Zero" after the reference return is complete. Often used with Absolute Pusle Coders. | When you adjust Parameter 1860, you are not
Since 1 unit = 0.001 mm: 5.000 mm / 0.001 mm per unit = 5000 units | Medium | | Reference Position Shift (1860)
Introduction In the world of CNC machining, precision is everything. A misalignment of just 0.001 inches can scrap a part costing thousands of dollars. Among the hundreds of system parameters that control a Fanuc CNC controller, Parameter 1860 often stands out as both a powerful tool and a potential hazard.
Do not use Parameter 1860 to compensate for a worn ballscrew or loose coupling. Fix the mechanical problem first. Case Study: Correcting a Lost Zero After Battery Failure Situation: A Fanuc Robodrill (16i control) lost absolute encoder batteries over the weekend. After replacing batteries, the Z-axis zero was off by -12.345 mm (the tool changer finger crashed into the spindle).
