5238-E P-61
SECTION 6 OFFSET FUNCTION
1-6.
Buffer Operation
The NC usually operates in the 3-buffer mode. While the positioning command from point A to point
B is being executed, the positioning point data of points C, D and E are read and stored in the buffer.
This is called the 3-buffer function.
When the tool nose radius function is activated, the target point E is calculated from straight lines
DE and EF. This means that the data in the block four blocks ahead the current target point are read
if the tool nose radius compensation function is active.
LE33013R0300800060001
1-7.
Path of Tool Nose "R" Center in Tool Nose Radius Compensation
Mode
To execute the motion shown below in the following program in the tool nose radius compensation
mode, the path of the tool nose R center is obtained as follows:
LE33013R0300800070001
F
E
D
C
B
A
Immediate target point
Data in Buffer
Reading point
(four blocks ahead)
Second positioning point
Third positioning point
Fourth positioning point
Present tool position
N1
N2
N3
N4
N5
G42
G41
X1
X2
X3
X4
X5
Z1
Z2
Z3
Z4
Z5
X+
Z+
N5
′
N4
′
N3
′
N2
′
N1
′
N4
N3
N2
N1
