| Problem | Cause | |---------|-------| | or PS0031 | 1860 set too high → reference point signal missed due to overshoot | | Inconsistent reference position (drift every cycle) | Speed too high for deceleration zone length (dog/switch timing mismatch) | | Long cycle time | 1860 set unnecessarily low (e.g., 100 mm/min on a large VMC) | | Machine overshoots reference point | 1860 > rapid rate (not allowed; parameter clamped internally) |
FANUC controllers utilize two distinct grid-shifting parameters depending on the encoder architecture: Target Hardware Grid Shift (Standard) Incremental encoders or physical deceleration dog homing. Parameter 1860 Grid Shift for Absolute Coder
Before changing any parameter, perform a complete backup of all CNC parameters, including PMC parameters. Many modern FANUC controls support this via memory card or RS-232. fanuc parameter 1860 full
If a linear guide way loses lubrication, a ballscrew bearing fails, or a telescopic way cover jams, the physical resistance increases exponentially. During a rapid move, the motor cannot push past this resistance fast enough, causing it to fall behind schedule and trip the 1860 limit. Check oil levels and inspect physical slides. 2. Failed or Weak Motor Brakes
If you encounter a "300 APC Alarm: Need ZRN" (Zero Return Needed), typically caused by a dead battery, you must re-establish the relationship between the physical machine and the encoder data. How to Enable Parameter Write Enable (PWE) on a Fanuc CNC | Problem | Cause | |---------|-------| | or
: When the machine is powered off, the absolute encoder (supported by a battery) keeps track of movement. Upon power-up, the control compares this data with Parameter 1860 to restore the absolute coordinate system immediately.
G10 L50 N1860 P1 R60 (Sets parameter 1860 for axis 1 (X) to 60 ms) G10 L50 N1861 P2 R80 (Sets parameter 1861 for axis 2 (Y) to 80 ms) ... G11 (End parameter input mode) If a linear guide way loses lubrication, a
user wants a long article about "fanuc parameter 1860 full". This is a technical topic about a specific parameter in FANUC CNC systems. To provide a comprehensive article, I need to gather detailed information about this parameter. I will search for its meaning, function, values, and related troubleshooting guides. I will also look for official documentation and forum discussions. search results show that parameter 1860 has multiple functions depending on the FANUC series. It can be related to reference point value (Series 16i/18i), two-stage backlash acceleration (0i-mc), or a CNC parameter for machines like CSC-1860. Some results also mention 1860 in the context of N/M gear ratio or as a settable value for APC/APZ. To get a complete picture, I need to open the most relevant-looking results, including the parameter manual, the Chinese forum post, the paycnc.com list, the CNC University page, the 360doc article, the suicha.net article, the cnczone.com thread, and the practicalmachinist.com thread. search results have provided information on the various functions of parameter 1860 across different FANUC series. I will structure the article by first introducing the multivalent nature of the parameter, then detailing its functions across different series, including reference point control, two-stage backlash acceleration, gear ratio, and its role in absolute encoder setup and general usage. I will also cover calculation methods, highlight the importance of documentation, and mention safety warnings. The article will draw from the open pages, including the manual snippet, the Chinese forum post, the paycnc list, the CNC University page, the 360doc article, the suicha.net article, the cnczone thread, and the practicalmachinist thread.ANUC Parameter 1860 is one of those technical settings that can trip up even experienced maintenance engineers, not because it's complicated, but because its function changes completely depending on which control series you're working on. Unlike universal parameters like 1815 for absolute encoders, Parameter 1860 is a true chameleon—it can control everything from reference point management to two-stage backlash acceleration and even gear ratio calculations. If you're an NC programmer, maintenance technician, or CNC machine tool manager, getting this wrong can mean the difference between a machine that runs perfectly and one that fails to home or crashes during an automatic cycle. This article covers all three major interpretations of FANUC Parameter 1860 across different platforms, as well as its critical role in absolute encoder resets, so you can correctly identify and use the setting for your specific machine.
handles small mechanical "grid shifts" for fine-tuning, Parameter 1860 handles the primary data offset for the absolute detector. Tool Change Alignment : On some machines, if the