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: On axes with separate linear scales that do not hold rotation data, Parameter 1815 #6 (NRT) determines if the reference position is updated when coordinates pass the value stored in 1860. Related Parameters for Work Offsets
Look across the screen columns to find the specific axis (X, Y, Z, 4th, etc.) that requires adjustment.
If you encounter a (Request for Reference Position Return), check parameter 1860. If the APRS bit is 0, the CNC has "forgotten" where it is. You will need to enable Parameter Write (PWE) and perform the homing procedure specified by your machine tool builder to reset it.
In simpler terms, Parameter 1860 tells the CNC control how much electrical angle adjustment is needed to perfectly align the spindle’s actual position with the commanded position. This parameter directly influences the accuracy of operations like:
The interplay between Parameter 1860 and Parameter 1861 further defines this control landscape. While 1860 sets the first-stage acceleration, Parameter 1861 is commonly associated with the maximum amplitude for the dual-position feedback function, another servo optimization tool for reducing following errors .
During the initial test after a power cycle, keep your hand on the Emergency Stop button. If the axis runs away or makes an unusual humming sound, hit the E-Stop immediately.
What are you currently using (e.g., 0i-D, 0i-F, 31i)?
The control expects an absolute encoder and attempts to read saved position data.
FANUC Parameter 1860 is a powerful testament to the flexibility and depth of FANUC's CNC controls. Whether it is silently maintaining the absolute position of your machine's axes or actively suppressing backlash to deliver a flawless surface finish, this single parameter plays a pivotal role in the machine's core functionality. By understanding its dual nature, respecting the warning signs, and following the proper configuration procedures, you can unlock the full potential of your FANUC-controlled machine tool, ensuring it produces accurate, high-quality parts reliably for years to come.
If you reverse the motor direction but do not reverse the feedback direction, the CNC will fault out immediately upon movement. 2. Parameter 1815 (Absolute Position Detector)
user wants a long article about FANUC parameter 1860 work. I need to gather information about what parameter 1860 is, its function, and how to use it. I'll follow the search plan. search results show some relevant pages. Result 0 from the first search seems to be a parameter manual page mentioning reference point value. Result 1 from the first search is a Chinese Q&A site that might explain the parameter. Result 2 from the first search is a forum thread about Fanuc 21i-T parameters. Result 0 from the second search is a parameter manual page. Result 0 from the third search is a thread about Fanuc 21i-TA control issues. Result 0 from the fourth search is about work shift, but not directly about parameter 1860. Result 5 from the first search is about reading/writing parameters. Result 0 from the fifth search is about parameter 1860 and 1861 for rotary scale. Result 1 from the fifth search is a thread about Fanuc 21iT zero return. I need to open these pages to gather more details. opened pages provide various details. The CNC School page says 1860 is "First acceleration for Two-Stage Backlash Acc. function". The Parameter Manual pages indicate 1860 and 1861 are reference point values for rotary axes. The CNC Zone thread shows a procedure for resetting absolute encoders that involves setting 1860=0 and 1861=0. The IndustryArena thread also mentions 1860 and 1861. The manual page for Series 21i/210i/210is also mentions reference point value. The manual for Series 30i/31i/32i mentions reference position data. There's also a thread about Fanuc 21iT not zeroing out, which mentions 1860 and 1861. The user wants a long article. I need to cover the function, applications, setting procedures, and practical considerations. I'll search for more information on two-stage backlash acceleration. 0 seems relevant. I'll open it. search results provide information on parameter 1860's functions: two-stage backlash acceleration first acceleration value, and reference point value for rotary axes with absolute encoders. I also have information on how to set it and related parameters. I'll structure the article with an introduction, sections on its role in reference point control, its two-stage backlash acceleration function, related parameters 1861, 1815, 1851, 1852, a procedure for restoring reference points, practical examples, safety precautions, and a conclusion. I'll cite the sources.locking the Mysteries of FANUC Parameter 1860: A Comprehensive Guide to CNC Work and Calibration
: Unlike incremental systems that require a physical trip to a limit switch (homing) every morning, systems using Parameter 1860 "remember" their position. This parameter stores the necessary data to maintain that reference. How Parameter 1860 Works in Practice
: Jog the axes to a known mechanical home position.
Many users mistakenly think 1860 is the only parameter needed to set a home position. In reality, it works as part of a set:
The Two-Stage Backlash Acceleration function actively counteracts this by briefly over-accelerating the servo motor during direction changes to "push through" the backlash. **Parameter 1860 defines the magnitude of the first stage of this acceleration () . **
Input increments (0.001 mm or 0.0001 inch depending on standard system increments).
: On axes with separate linear scales that do not hold rotation data, Parameter 1815 #6 (NRT) determines if the reference position is updated when coordinates pass the value stored in 1860. Related Parameters for Work Offsets
Look across the screen columns to find the specific axis (X, Y, Z, 4th, etc.) that requires adjustment.
If you encounter a (Request for Reference Position Return), check parameter 1860. If the APRS bit is 0, the CNC has "forgotten" where it is. You will need to enable Parameter Write (PWE) and perform the homing procedure specified by your machine tool builder to reset it.
In simpler terms, Parameter 1860 tells the CNC control how much electrical angle adjustment is needed to perfectly align the spindle’s actual position with the commanded position. This parameter directly influences the accuracy of operations like:
The interplay between Parameter 1860 and Parameter 1861 further defines this control landscape. While 1860 sets the first-stage acceleration, Parameter 1861 is commonly associated with the maximum amplitude for the dual-position feedback function, another servo optimization tool for reducing following errors . fanuc parameter 1860 work
During the initial test after a power cycle, keep your hand on the Emergency Stop button. If the axis runs away or makes an unusual humming sound, hit the E-Stop immediately.
What are you currently using (e.g., 0i-D, 0i-F, 31i)?
The control expects an absolute encoder and attempts to read saved position data.
FANUC Parameter 1860 is a powerful testament to the flexibility and depth of FANUC's CNC controls. Whether it is silently maintaining the absolute position of your machine's axes or actively suppressing backlash to deliver a flawless surface finish, this single parameter plays a pivotal role in the machine's core functionality. By understanding its dual nature, respecting the warning signs, and following the proper configuration procedures, you can unlock the full potential of your FANUC-controlled machine tool, ensuring it produces accurate, high-quality parts reliably for years to come. : On axes with separate linear scales that
If you reverse the motor direction but do not reverse the feedback direction, the CNC will fault out immediately upon movement. 2. Parameter 1815 (Absolute Position Detector)
user wants a long article about FANUC parameter 1860 work. I need to gather information about what parameter 1860 is, its function, and how to use it. I'll follow the search plan. search results show some relevant pages. Result 0 from the first search seems to be a parameter manual page mentioning reference point value. Result 1 from the first search is a Chinese Q&A site that might explain the parameter. Result 2 from the first search is a forum thread about Fanuc 21i-T parameters. Result 0 from the second search is a parameter manual page. Result 0 from the third search is a thread about Fanuc 21i-TA control issues. Result 0 from the fourth search is about work shift, but not directly about parameter 1860. Result 5 from the first search is about reading/writing parameters. Result 0 from the fifth search is about parameter 1860 and 1861 for rotary scale. Result 1 from the fifth search is a thread about Fanuc 21iT zero return. I need to open these pages to gather more details. opened pages provide various details. The CNC School page says 1860 is "First acceleration for Two-Stage Backlash Acc. function". The Parameter Manual pages indicate 1860 and 1861 are reference point values for rotary axes. The CNC Zone thread shows a procedure for resetting absolute encoders that involves setting 1860=0 and 1861=0. The IndustryArena thread also mentions 1860 and 1861. The manual page for Series 21i/210i/210is also mentions reference point value. The manual for Series 30i/31i/32i mentions reference position data. There's also a thread about Fanuc 21iT not zeroing out, which mentions 1860 and 1861. The user wants a long article. I need to cover the function, applications, setting procedures, and practical considerations. I'll search for more information on two-stage backlash acceleration. 0 seems relevant. I'll open it. search results provide information on parameter 1860's functions: two-stage backlash acceleration first acceleration value, and reference point value for rotary axes with absolute encoders. I also have information on how to set it and related parameters. I'll structure the article with an introduction, sections on its role in reference point control, its two-stage backlash acceleration function, related parameters 1861, 1815, 1851, 1852, a procedure for restoring reference points, practical examples, safety precautions, and a conclusion. I'll cite the sources.locking the Mysteries of FANUC Parameter 1860: A Comprehensive Guide to CNC Work and Calibration
: Unlike incremental systems that require a physical trip to a limit switch (homing) every morning, systems using Parameter 1860 "remember" their position. This parameter stores the necessary data to maintain that reference. How Parameter 1860 Works in Practice
: Jog the axes to a known mechanical home position. If the APRS bit is 0, the CNC has "forgotten" where it is
Many users mistakenly think 1860 is the only parameter needed to set a home position. In reality, it works as part of a set:
The Two-Stage Backlash Acceleration function actively counteracts this by briefly over-accelerating the servo motor during direction changes to "push through" the backlash. **Parameter 1860 defines the magnitude of the first stage of this acceleration () . **
Input increments (0.001 mm or 0.0001 inch depending on standard system increments).