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2.13
PROGRAM SUPPORT FUNCTIONS (Cont'd)
Once
the dry
run
switch
is turned cm and the solid
tap
mode is
started, tapping feed
by
GS4/G74 is processed the same
as that
of
conventional C84/G74
even after the
dry
iun
switch is turned off.
Therefore,
the spindle is
not
activated when G93 is
executed. Whether dry run in the
G93
block is
ON,
is determined when the G&3
code is read.
This determination
normally
occurs
during
execution of
a block
immediately preceding
tlie
G93 block.
Therefore,
when G93 is operated with
dry
run ON' for
program check,
etc.,
be
sure
that the
dry
run switch is ON from the
beginning and do
not
change
it before
completion.
Auxiliary function
lock
if
Gy:!
is executed with the
auxiliary
function lock switch ON. G93
is
nullified,
and
the
t
.84/074
commands in the solid
tap
mode are
handled
as
conventional
type
GS4/G74.
Positioning control on
the
spindle
is
not
exercised
cither.
Whether the
auxiliary function in the G93 block is
locked,
is determined
when
the
G93 code is read.
Therefore,
when
performing program
check,
etc.
with
auxiliary
function lock switch
ON.
be sure the dry run switch is also
ON from
the beginning and do
not
change
it before
completion.
Machine
lock,
Z-axis
disregard.
When solid
lap
is executed with
niachim.lock.Z
axis disiegard ON. the spindle
rotates,
but Z-axis
is only displayed.
Override, spindle
override
Feed override during solid
tap
is
entirely
fixed.
However, rapid
feedrate
override
is effective.
Spindle
override
input
in the solid
tap
mode
is nullifcd. and
entirely
fixed.
Feed hold
Feed hold
during cutting by
solid
tap
G84/G74
is
invalid.
Change
of mode
Change
of mode during
cutting by solid
tap
GS4/G74
is
invalid.
Program restart
When the
program
is restarted
for
any
block in the solid
tap
mode,
093 is
not
executed. G93
must
therefore be executed
by commanding it with
MDI.
Although
E command for
reciprocal
feed does
not
cause an
alarm,
it is disregard¬
ed. The
return
feedrate is
set
by
parameter
pml252.
(b)
(ci
(d)
(c)
(f)
<g>
<h>
198
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