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

PROGRAMMING
15. COMPENSATION FUNCTION
B–62754EN/01
250
When machining of the step is commanded by circular machining in the
case of a program containing a step smaller than the tool nose radius, the
path of the center of tool with the ordinary offset becomes reverse to the
programmed direction. In this case, the first vector is ignored, and the tool
moves linearly to the second vector position. The single block operation
is stopped at this point. If the machining is not in the single block mode,
the cycle operation is continued. If the step is of linear, no alarm will be
generated and cut correctly. However uncut part will remain.
S
The first vector is ignored
Tool nose radius center path
Programmed path
Workpiece
Center of the circular
machining
An overcutting will result if the first vector is not ignored.
However, tool moves linearly.
Linear movement Stop position after execution of a single
block
In chamfering or corner arcs, tool nose radius compensation only be
performed when an ordinary intersection exists at the corner.
In offset cancel mode, a start–up block or when exchanging the offset
direction, compensation cannot be performed, an P/S alarm (No.39) is
displayed and the tool is stopped.
In inner chamfering or inner corner arcs, if the chamfering value or corner
arc value is smaller than the tool nose radius value, the tool is stopped with
an P/S alarm (No.39) since overcutting will occur.
Stopped
here
Programmed
path
Tool nose
radius
center path
Tool nose
radius
center path
Programmed
path
Stopped
here
The valid inclination angle of the programmed path in the blocks before
and after the corner is 1 degree or less so that the P/S alarm (No.52, 54)
generated by the calculating error of tool nose radius compensation does
not occur.
When this angle is 1 degree or less, the alarm is not generated.
D Machining a step smaller
than the tool nose radius
15.3.7
Correction in
Chamfering and Corner
Arcs

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