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(7)
Method of
commanding 2-step
hole canned
cycle
Two-step cycles are provided
to
enable opening holes in
hollow
workpieces such as castings.
These
cycles correspond
to
G80
to
G
89
canned
cycles.
For
two-step
hole commands,
100 is
added
to
each G
code
to
produce
G181.
G182, G185, G186,
G187, and
G189, com¬
mands.
•2-step hole drilling (G181) command
l
U
18 1 X_ Y
_
Z_
R.
L._
V_
K.
L_
W.
;
Q':v4
?
INITIAL POINT
i
l
t
W-
POINT
R POINT
E FEED
F FEED
J-
POINT
K-POINT
r
E FEED
,
,
F FEED
i
'
Z-POINT
o
SINGLK-HLOCK
STOP
J
:
2-STEP
HOLE
RAPID FEEDRATE
START POINT
(absolute/incrcmental)
K :
2-STEP
HOLE CUTTING FEED START POINT
(absolute/incrcmental)
E
:
2-STEP FEEDRATE
(1st step :
E, 2nd
step :
F)
Q
:
SPEED CHANGE POINT
(incremental)
W :
NEW INITIAL POINT
(absolutc/incrcmcntal)
To
use
J
or
K
in
the
Gyl
I
incremental
I
mode,
use
an
incremental
value
measured
from point R.
Fig.2.13.13 2
-step
Hole Drill
(G181)
Command
-
189
-
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