
B–63503EN–1/01
11. PROGRAM COMMAND
605
The cutting conditions are changed at each pecking operation (forwarding
→ cutting → retracting) during one G83 cycle. (Appropriate setting of
bits 1 and 2 of parameter No. 5160 can specify that the cutting conditions
are not to be changed.)
The cutting feedrate programmed with the F word is changed during each
of the second and subsequent cutting operations. Parameter Nos. 5166
and 5167 specify the ratio of change for a case in which a skip signal was
received during the previous cutting operation and a case in which no skip
signal was received during the previous cutting operation, respectively.
Cutting feed rate = Fă a
(First time) a = 1.0
(Second and subsequent times) a = a b B 100
(where b is the ratio of change for the first time)
Skip during the previous cutting: b = b1% (parameter No. 5166)
No skip during the previous cutting: b = b2% (parameter No. 5167)
When the ratio a at which the cutting feedrate is changed becomes less
than the ratio specified in parameter No. 5168, changing the cutting
feedrate is discontinued. The upper limit to the newly specified cutting
feedrate is the maximum cutting feedrate.
The spindle speed programmed with the S word is changed during each
of the second and subsequent cutting operations. Parameter Nos. 5164
and 5165 specify the ratio of change for a case in which a skip signal was
received during the previous cutting operation and a case in which no skip
signal was received during the previous cutting operation, respectively.
Spindle speed = Să g
(First time) g = 1.0
(Second and subsequent times) g = g d B 100
(where d is the ratio of change for the first time)
Skip during the previous cutting: d = d1% (parameter No. 5164)
No skip during the previous cutting: d = d2% (parameter No. 5165)
If the cutting feedrate is clamped at the lower limit, the spindle speed is
not changed. The upper limit to the newly specified spindle speed is the
maximum S analog data.
Change of cutting
conditions
D Changing of cutting
feedrate
D Changing of spindle
speed