Fanuc Parameter 1860 Full _top_ Jun 2026

The Ghost in the Machine: Understanding Fanuc Parameter 1860

Cut a circle (e.g., 100mm diameter) at a moderate feed rate (e.g., 1000mm/min) to check for quadrant protrusions.

When a machine uses a linear scale (like Heidenhain or FANUC linear scales) mounted directly to the machine casting, it is a full-closed loop system. Here, Parameter 1860 must be calculated manually based on physical mechanics.

. While standard relative or incremental zero-return positioning relies primarily on Parameter 1850 following a physical deceleration switch trip, machines utilizing absolute linear scales or absolute rotary encoders use Parameter 1860 to electronically fine-tune the absolute reference point (Home Position) without physically moving the encoder, motor, or scale components. fanuc parameter 1860 full

Your Fanuc servo system operates on a "Grid" generated by the position feedback device (pulse coder, absolute encoder, or scale). As the motor rotates, the encoder sends pulses. The control identifies a specific pulse as the "Grid Point" – a reproducible position for machine zero.

bits), which tells the system that an absolute pulse coder is being used and whether the reference position has been established. Coordinate Synchronization

Factory default is almost always 0 . If you see a non-zero value, the machine builder or a previous technician set it. The Ghost in the Machine: Understanding Fanuc Parameter

Parameter 1860 represents the (also referred to as the "rotation angle at which the coordinate value is rounded"). It tells the Fanuc CNC when to "reset" or round the machine position back to zero on a rotary axis.

Misconfiguring this value directly shifts your machine coordinate system, causing physical machining offsets, tool changer misalignments, or critical overtravel alarms. Core Technical Profile: Parameter 1860 Technical Specification Function Name Grid Shift Amount for Absolute Position Detector Applicable CNC Controls FANUC 0i-D/F/F Plus, 16i/18i/21i, 30i/31i/32i Series Data Type 2-word / 4-byte signed integer (Axis-specific) Standard Units

Advanced programs can modify 1860 on the fly. This is powerful for optimizing roughing vs. finishing in one setup. As the motor rotates, the encoder sends pulses

If the deviation exceeds the value in 1860, the system generates SV0410 SPECIFIED STOP EXCESS ERROR . 2. Standard Values and Units The value in Parameter 1860 is set in Detection Units . In most standard metric systems, 1 detection unit = In most standard inch systems, 1 detection unit =

a (mm/s²) = Vc / T

: It acts as the "calibration" value for an absolute encoder. When you perform a zero-return or "homing" procedure on a machine with absolute encoders, the system calculates the difference between the encoder's current reading and the physical home position, then saves this value in Parameter 1860. Automatic Updates : Typically, you do manually enter a value here. When Parameter 1815