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(b)
Each
pitch
dwell command
In
deep hole drilling G73 and G83,
drill load can be reduced
by
inserting
a
small
dwell
at
the hole bottom of each
pitch.
The dwell
time is commanded by setting Pm401 or address P.
O
If each pitch dwell is commanded
by
the
program, setting
PnvJOl
is
overridden.
If
not
commanded
by
the
program,
dwell is
performed according
to
the value of
setting
Pm-Jfll
(l
= lmst.
PO is
also matched
to
PnvIUI.
©
The default value of hole bottom dwell
can
be
set
with #401.
0
PnvIOl
can
be nullified
by
parameter
Pm-1017 04.
If there
is
no
P command
at
this
lime,
pitch dwell is
not performed.
I
Pm4017 D4 =
0
:
Pm401 invalid
Pm4017 D4
=
l
1 Pm4l)l
valid
(c)
Lift in the middle command
(C-point
command)
It
is
possible to
lift the tool
to
R-point in
the middle of
high-speed
deep
hole drilling
G73;
in
addition,
the tool can be
single-block
stopped.
As
a result,
it is possible
to
remove chips during the cycle.
This is commanded with address C.
The C-point is
specified by an unsigned
incremental value. The
cutting tool
retracts to
the
R-point after each drilling of distance C.
For C-a.\is
set
as
the
additional
axis,
this
command
is
invalid.
This is axis
command
with
address C.
First
drilling depth: (R+C)
Secuiid
drilling depth:
IR+2C)
-
Initial point
Point R
CL
1 1
o
t
u
Point C
. 4
Point C
® Dwell
0
Single-block
stop
-
*-ÿ
-
Point
Z
Both C and
Q
are unsigned
incremental values.
Specification
of
negative value
is
meaningless.
Fig.2.13.8
Lift in the Middle Command
(
C-point Command
)
185
-
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