Fanuc Series 15i/150i-MA (Programming) Operators Manual

19.AXIS CONTROL FUNCTIONS PROGRAMMING B-63324EN/03
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(3) When the upper dead point is changed during movement from the
lower dead point to the upper dead point
New upper dead point
Previous lower dead point
Changing the upper dead point
The tool first moves to the previous upper dead point, then to the
lower dead point, and finally to the new upper dead point.
Once movement to the lower dead point has been completed, the
previous chopping delay compensation is set to 0, and chopping
delay compensation is performed based on the new data.
(4) When the lower dead point is changed during movement from the
lower dead point to the upper dead point
Previous upper dead point
Previous lower dead point
New lower dead point
Changing the lower dead point
The tool first moves to the upper dead point, then to the new lower
dead point.
Once movement to the upper dead point has been completed, the
previous chopping delay compensation is set to 0, and chopping
delay compensation is performed based on the new data.
- Chopping delay compensation function
When high-speed chopping is performed with the grinding axis, a servo
delay and acceleration/deceleration delay occur. These delays prevent
the tool from actually reaching the specified position.
The CNC measures the difference between the specified position and
the actual tool position, and performs chopping delay compensation to
compensate for the difference.
To compensate for this displacement, an amount of travel equal to the
distance between the upper and lower dead points, plus an appropriate

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