FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
15. COMPENSATION FUNCTION
B–62754EN/01
252
In outer chamfering with an offset, a limit is imposed on the programmed
path. The path during chamfering coincides with the intersection points
P
1
or P
2
without chamfering, therefore, outer chamfering is limited. In
the figure above, the end point of the tool center path with chamfering
coincides with the intersection point (P2) of the next block without
chamfering. If the chamfering value is more than the limit value
specified, P/S alarm No.52 or 55 will be displayed.
Tool nose radius compensation is not performed for commands input
from the MDI.
However, when automatic operation using 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, tool nose radius compensation 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
.
15.3.8
Input Command from
MDI

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