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Fanuc Parameter 1860 File

| Control Series | Data Format | Minimum Unit | Typical Range (Linear) | |----------------|-------------|--------------|------------------------| | 0i-D / 0i-F | Integer (mm/min) | 1 mm/min | 100 – 600 | | 16i/18i/21i | Integer | 1 mm/min | 200 – 800 | | 30i/31i/32i-B | Real (decimal) | 0.001 mm/min | 200.000 – 800.000 | | Power Motion i | Real (mm/min) | 0.001 mm/min | 100 – 1000 |

Note: Inch machines: multiply mm/min by 0.03937 to get in/min. fanuc parameter 1860

| Condition | Symptom | Root Cause | |-----------|---------|-------------| | 1860 too high (e.g., 2000 mm/min on a linear axis) | Axis slams into dog, overshoots reference point, inconsistent home position ± several encoder counts. May trigger overtravel alarm after homing. | High inertia prevents motor from stopping precisely on the marker pulse. | | 1860 too low (e.g., 30 mm/min) | Homing takes excessively long (10-20 seconds per axis). No immediate error, but wasted cycle time. | Creep speed is unnecessarily slow—the marker detection is reliable at moderate speeds. | | 1860 optimal (typical: 100-600 mm/min) | Fast, consistent reference return. Home position repeatable within 1 micron. | Speed allows motor to stop within one encoder count (or fractional count for serial pulse coders). | | Control Series | Data Format | Minimum

Conclusion: Optimize 1860 for speed without sacrificing repeatability. | Condition | Symptom | Root Cause |

If Parameter 1860 is set too low, the machine accelerates violently. This puts immense stress on the ballscrews, thrust bearings, and servo motors. Over time, this leads to premature mechanical failure, reversed backlash, and accuracy issues.

The maximum stable 1860 is the highest speed at which the axis stops within 1-2 encoder counts every time. Back off by 10-15% for margin.

The PMC (Programmable Machine Controller) can override reference return speed in some custom cycles. Check ladder rungs referencing address G100 (reference return speed selection). If PMC forces a different speed, Parameter 1860 becomes secondary.