
B–63523EN–1/03
1. AXIS CONTROL
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Before chopping can be started, the chopping axis, reference position,
upper dead point, lower dead point, and chopping feedrate must be set
using the parameter screen (or the chopping screen).
Chopping is started once chopping start signal CHPST has been set to 1.
This signal is ignored, however, during chopping axis movement.
When chopping hold signal *CHLD is set to 0 during chopping, the tool
immediately moves to point R. Again setting the chopping hold signal to
1 restarts chopping.
Chopping can also be stopped by setting chopping start signal CHPST to
0, but only when chopping was started by using that signal.
Methode of starting chopping Methode of stopping chopping State
Signal CHPST = 0 Stopped
G80 Stopped
Signal CHPST = 0 Not stopped
G80 Stopped
NOTE
1 Switching to manual mode or suspending automatic
operation, by means of feed hold, does not stop chopping.
2 In chopping mode, a chopping axis move command or
canned cycle command cannot be specified.
3 If a G81.1 command is specified during chopping started by
the signal, chopping is not stopped. If point R, the upper
dead point, lower dead point, or chopping feedrate has
been modified by using the G81.1 command, chopping is
continued, but using the modified data.
4 The use of chopping start signal CHPST to start chopping
is not enabled immediately after power–on; it is not enabled
until the completion of manual reference position return.
From the start of chopping to point R, the tool moves at the rapid traverse
rate (specified by parameter No. 1420).
The override function can be used for either the normal rapid traverse rate
or chopping feedrate, one of which can be selected by setting ROV (bit
0 of parameter No. 8360).
When the chopping feedrate is overridden, settings between 110% and
150% are clamped to 100%.
Between point R, reached after the start of chopping, and the point where
the chopping is canceled, the tool moves at the chopping feedrate
(specified by parameter No. 8374).
The chopping feedrate is clamped to the maximum chopping feedrate (set
with parameter No. 8375) if the specified feedrate is greater than the
maximum chopping feedrate.
The feedrate can be overridden by 0% to 150% by applying the chopping
feedrate override signal.
Explanations
D Chopping activated by
signal input
D Chopping feedrate
(feedrate of movement to
point R)
D Chopping feedrate
(feedrate of movement
from point R)