You would change this value if your machine’s home position is physically "off" by a small, consistent amount. Instead of re-mounting a cam or switch, you enter a "shift" value here to tell the control where the true zero is relative to the first grid pulse it detects. How to Set It
Detection units (the smallest increment the machine can move). 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. | You would change this value if your machine’s
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). | Parameter | Name | Purpose | |
