Since cutting starts with the concave
nearest the start point, the cutting path
is interrupted if it hits the convex be–
yond the concave.
The concave is cut to
its bottom.
Then, the cutting cycle re-
turns to the interrupted point to perform
cutting beyond it.
DISCONTINUATION
(ii)
DEPTH OF
CUT D
For a simple concave, only one interrupted
point is provided.
However, for a complex
concave containing a smaller concave and
a convex as shown below, the cutting path
is
interrupted first at the larger convex
then at the smaller convex.
DISCONTINUATION 1
cONcAvE\ /
UA
CONCAVE
The maximum number of interrupted
points that, allows cutting is three, be-
yond which cutting is disabled, causing
“ 097” error.
Within this limitation, any
number of concaves is allowed.
DISCONTINUATION 1
,
DISCONTINU-vA
ATION 4
Sample Contour Not Allowing Cutting :ing
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
Any contour having an overhang does not
allow cutting.
Hence,
the Z-axis specifi-
cation value of the finishing shape program
should be a monotonous variation.
The termination block for the finishing shape
program has the following limitations:
For the G command of the termination block
(Nnf. . .
; ) , specify GO1 or GOO.,
pal.
The retracting amount after each
cYcle may be set by the setting.
in princi–
approach
RETRACTING AMOUNT SETTING
#6202 (FOR G 71)
\
\
.-----—
)T
CUTTING PATH
‘1
\
Each block of the finishing shape program
should be of monotonous increase or mono-
tonous decrease.
A circular arc which
extends over two or more quadrants must
be divided into two blocks before being
programmed.
Generally, Z–axis finishing allowances W
and K are not specified. Otherwise, a bite
is caused into the wall of the corresponding
side. If “R 1“ is not specified, the conven-
tional monotonous increase /monotonous de–
crease stock removal cycle is provided.
Approach is performed at the feedrate.
[t is not affected by the G code of the
finishing shape program. Hence, de-
pending on the finishing shape program,
positioning may be performed by rapid
traverse after the approach at feedrate.
—A
*
A
APPROACH
‘d
97
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