Disclaimer: Always consult your machine tool builder's manual before modifying parameters. The author assumes no responsibility for machine damage or injury resulting from improper parameter changes.
Properly calibrated backlash compensation immediately delivers better roundness during circular interpolation and eliminates small steps on tapered cuts. Adjusting Grid Shifts for Perfect Reference Points
Once the first reference point is stable, configure additional reference points for automation. For example, many machining centers use the second reference point (parameter 1241) for tool changes and the third reference point (parameter 1242) for pallet exchange. These can be called in programs using G30 commands: G30 P2 X0 Y0 Z0 returns to the second reference point coordinates. fanuc ot reference parameter better
Grid shift compensates for the distance from the deceleration switch release point to the nearest encoder grid line.
Note: Parameter numbers may vary slightly between 0T Model A, B, C, and D. Always consult your machine’s manual. Adjusting Grid Shifts for Perfect Reference Points Once
The answer lies in understanding a small but critical set of parameters: (and their associated Diagnostic bits).
If your machine allows, over moving the physical deceleration dog. Adjusting P0050 is more precise and repeatable. Only move the limit switch dog if you exceed the adjustment range of P0050 (max 9999 pulses). Grid shift compensates for the distance from the
: Parameters like 700–706 (often used in 0-series controls to define travel limits) and specific grid shift values determine the "Zero" point after the axis hits a physical limit switch.
This is the most common "deep" adjustment. It allows you to shift the electrical zero point relative to the encoder's marker pulse (one-rotation signal).
This adjusts for physical lead screw inaccuracies. Properly setting the pitch error interval can dramatically improve long-travel precision.