FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
15. COMPENSATION FUNCTION
B–62764EN/01
322
Cutter compensation C is not performed for commands input from the
MDI.
However, when automatic operation using the absolute commands is
temporarily stopped by the single block function, MDI operation is
performed, then automatic operation starts again, the tool path is as
follows :
In this case, the vectors at the start position of the next block are translated
and the other vectors are produced by the next two blocks. Therefore,
from next block but one, cutter compensation C is accurately performed.
V
B2
V
B1
V
C1
V
C1
V
C2
V
B1
V
B2
P
B
P
A
P
B
P
C
P
D
Command
for MDI
When position P
A
, P
B
, and P
C
are programmed in an absolute command,
tool is stopped by the single block function after executing the block from
P
A
to P
B
and the tool is moved by MDI operation. Vectors V
B1
and V
B2
are translated to V
B1
’ and V
B2
’ and offset vectors are recalculated for the
vectors V
C1
and V
C2
between block P
B
–P
C
and P
C
–P
D
.
However, since vector V
B2
is not calculated again, compensation is
accurately performed from position P
C
.
15.6.7
Input Command from
MDI

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