Fanuc Symbol CAPi T Operators Manual

B–63304EN/02
2. CAUTIONS FOR USING
Symbolic FAPT
VARIOUS FUNCTIONS AND
PRECAUTIONS OF Symbolic FAPT
381
(13) If the cutting area is initialized in machining definition
If the number of elements that form a part figure is increased or
decreased, it is determined that because the final part figure has
been changed, it is dangerous to keep using the previously set cutting
area,” the cutting area in an affected process is initialized (the end
and start points of the cutting area are set with the start and end points
of the part figure, respectively), thus prompting the operator to
re–set up the correct cutting area.
The number of elements that form a part figure may be increased or
decreased in the following two cases:
À An element of the part figure is added or deleted, resulting in a
change to the total number of elements of the part figure.
Á In machining definition, a specified cutting area is compensated by
a cutting edge angle check or an overhang check. (In this case, the
number of elements of the part figure increases because the part
figure is divided internally. This is intended to clearly indicate the
start and end points of the cutting area when another tool is used
on a portion that is left after compensation.)
Á The following description uses case Á as an example. In outer
surface finishing, setting the start and end points of a cutting area at
positions A and B shown in Fig. 2.5 (o) defines the portion indicated
by hatching as the cutting area before compensation. Compensation
changes the portion indicated by hatching as shown in Fig. 2.5 (p),
thus dividing part figure element c at point C (so, the number of
elements increases by one). To the contrary, if the cutting area is
divided into two as shown in Fig 2.5 (q), no compensation is made
on the specified cutting area, thus keeping the number of elements
of the part figure unchanged.
This way, changing the number of part figure elements by changing
the start and end points of the cutting area causes the cutting area
used in the subsequent processes to be initialized. In this case, it is
necessary to reset up an appropriate cutting area.
Fig. 2.5 (o) Fig. 2.5 (p) Fig. 2.5 (q)
Cutting
area
Part figure
Cutting
area
Part figure
Cutting
area
Part figure
Element c
A
B
A
B
A
B
C

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