Fanuc Parameter 1829 ((full)) -
Issues with lubrication or a faulty ball screw can cause the axis to "jump" or settle poorly, exceeding the limit. Typical Resolution:
If the servo parameters are tuned too "softly" or the acceleration is too aggressive, the axis might drift to a stop rather than stopping instantly, violating the 1829 threshold.
If you find the machine is too "loose" when stopped (drifting slightly), you may need to decrease the value, provided this doesn't cause constant alarms.
CNC machinists, maintenance technicians, and engineers frequently encounter axis synchronization and positioning issues on FANUC-controlled machines. When a machine tool exhibits poor surface finishes, fails to round corners accurately, or throws servo alarms during high-speed interpolation, the root cause often traces back to servo tuning parameters. Among these, plays a critical role in controlling the axis position loop gain for rigid tapping and specific interpolation states. fanuc parameter 1829
: On vertical axes, ensure the motor brake is holding properly when the servos are disabled.
Parameter 1829 does not work in isolation. Its function is closely related to several other servo parameters. Proper tuning requires a holistic understanding of all these settings.
While moving the axis at low speeds with the expanded parameter limit: Go to the > DIAGN (Diagnostic) screen. Issues with lubrication or a faulty ball screw
Generally, the parameter should be set based on the rapid traverse deviation plus a reasonable safety margin. Adjusting for Stability:
Controls Position Loop Gain for Rigid Tapping / Precision State 2000 – 3000 (20.00 – 30.00 s⁻¹) Associated Alarms SV 0410, SV 0411, SV 0438 Prerequisite Parameter Parameter 1825 (Standard Feed Gain) Critical Rule
To isolate mechanical issues from electrical faults, technicians often temporarily increase the value of Parameter 1829. : On vertical axes, ensure the motor brake
| Parameter | Function | Relationship with 1829 | | :--- | :--- | :--- | | | Servo Loop Gain | Higher gain reduces position error. Can cause oscillation if too high. | | 1826 | In-Position Width | Machine considered "arrived" when error within this value. Must be smaller than 1829. | | 1828 | Motion Position Deviation Limit | For errors during axis movement. Must be larger than 1829. | | 1827 | Cutting In-Position Width | Special case for cutting feed. 1801#4 selects which parameter (1826 or 1827) is used. |
FANUC Parameter 1829: Backlash Compensation (Arbitrary Feed)
: Physical binds, packed chip buildup, or a lack of lubrication in the ballscrew can prevent the axis from reaching its precise target.
Issues with lubrication or a faulty ball screw can cause the axis to "jump" or settle poorly, exceeding the limit. Typical Resolution:
If the servo parameters are tuned too "softly" or the acceleration is too aggressive, the axis might drift to a stop rather than stopping instantly, violating the 1829 threshold.
If you find the machine is too "loose" when stopped (drifting slightly), you may need to decrease the value, provided this doesn't cause constant alarms.
CNC machinists, maintenance technicians, and engineers frequently encounter axis synchronization and positioning issues on FANUC-controlled machines. When a machine tool exhibits poor surface finishes, fails to round corners accurately, or throws servo alarms during high-speed interpolation, the root cause often traces back to servo tuning parameters. Among these, plays a critical role in controlling the axis position loop gain for rigid tapping and specific interpolation states.
: On vertical axes, ensure the motor brake is holding properly when the servos are disabled.
Parameter 1829 does not work in isolation. Its function is closely related to several other servo parameters. Proper tuning requires a holistic understanding of all these settings.
While moving the axis at low speeds with the expanded parameter limit: Go to the > DIAGN (Diagnostic) screen.
Generally, the parameter should be set based on the rapid traverse deviation plus a reasonable safety margin. Adjusting for Stability:
Controls Position Loop Gain for Rigid Tapping / Precision State 2000 – 3000 (20.00 – 30.00 s⁻¹) Associated Alarms SV 0410, SV 0411, SV 0438 Prerequisite Parameter Parameter 1825 (Standard Feed Gain) Critical Rule
To isolate mechanical issues from electrical faults, technicians often temporarily increase the value of Parameter 1829.
| Parameter | Function | Relationship with 1829 | | :--- | :--- | :--- | | | Servo Loop Gain | Higher gain reduces position error. Can cause oscillation if too high. | | 1826 | In-Position Width | Machine considered "arrived" when error within this value. Must be smaller than 1829. | | 1828 | Motion Position Deviation Limit | For errors during axis movement. Must be larger than 1829. | | 1827 | Cutting In-Position Width | Special case for cutting feed. 1801#4 selects which parameter (1826 or 1827) is used. |
FANUC Parameter 1829: Backlash Compensation (Arbitrary Feed)
: Physical binds, packed chip buildup, or a lack of lubrication in the ballscrew can prevent the axis from reaching its precise target.
