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Only the
newly
commanded addresses
are changed including
switching G90
—
G91
as
in N2
—
N3 in the above
example.
For
uncommanded
addresses,
the
positions
commanded
by
the
previous
block
are
retained.
Changes
of R and Z in this
program example
are
summarized in Table 2.13.6.
(d) R-point,
Z-point switching
in the G91 mode
If R is commanded without
commanding
Z when
a
canned cycle is
performed
in the G91
mode,
Z-point is
recalculated
to
obtain
an
increment
quantity
from
new R-point.
I
Table
2.13.7
Increment
Quantity
at R
and Z Points
G92
XO YO
ZO
C98 G91
G$1
X
......
Y
. . . . . .
R-5.0 F-
R Point
Z Point
X
-Rÿ5LC
X -Z -3.0;
R -4.0 Z -11.0;
-5.U
-IS.U
-17.0
<!'
-7.il
fj* -7.0
-1IJ.0
-4.0
-IS.
II
cl1
Because the
Z-point
position is
commanded
to
be
-
10.0
in
the G91
mode in advance.
(2)
Because the R-point
position is
commanded
to
be
-
7.0 in the G91
mode
in
advance.
(4)
Method of
commanding
G73 and G83
(a)
Variable
pitch
command
In the G73 and G83
deep
hole
drilling cycles,
variable
pitch
cut
can
be commanded by using address, I,J,
or
K in
place
of address
Q
that
is used
to
command
a
certain cut-in
quantity.
I
:
Initial value of cut-in
quantity
J
'
Decreased value for 2nd and
subsequent
cuts
K
Final value of cut-in
quantity
Addresses P. Q. I.
J, and
K
arc
modal
in
a
canned
cycle, so
that
once
commanded, they
remain valid until the canned
cycle
is canceled.
To be commanded
without
a sign
-
183
-
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