
B–61404E/08
13. FUNCTIONS TO SIMPLIFY
PROGRAMMING
PROGRAMMING
189
(1)The small–diameter peck drilling cycle is executed by specifying G83
after specifying an M code for the small–diameter peck drilling cycle.
During the execution of this cycle, the small–diameter peck drilling
cycle in–progress signal is output during the period between point R
positioning of the drilling axis and the return to point R/initial level.
(2)As an overload torque detection signal, the skip signal (X008#7) is
used. The skip signal is enabled only while the drilling axis is placed
between point R and point Z, and an advance or cutting operation is
being performed. When the skip signal is entered while an advance
or cutting operation is being performed, a retract operation is started
immediately.
(3)In one G83 cycle, the cutting condition is changed for each peck
drilling operation (advance → cut → retract).
D Cutting feedrate change
The cutting feedrate programmed using an F code is changed for
each of the second and subsequent cutting operations. In parameter
Nos. 307 and 308, specify the change ratios applicable when the
skip signal is received and when the skip signal is not received,
respectively, in the previous cutting operation.
Cutting feedrate = F α
(First operation) α = 1.0
(Second and subsequent operations) α = α βB100
β represents the change ratio for one operation. If the skip signal
was entered during the previous cutting:
β = Parameter No. 307
When the skip signal was not entered during the previous cutting:
β = Parameter No. 308
If the cutting feedrate change ratio α becomes smaller than the
value set in parameter No. 309, no further cutting feedrate changes
are made.
D Spindle speed change
The spindle speed programmed using an S code is changed for each
of second and subsequent advance operations. In parameter Nos.
305 and 306, specify the change ratios applicable when the skip
signal is received and when the skip signal is not received,
respectively, in the previous cutting operation.
Spindle speed = S γ
(First operation) γ = 1.0
(Second and subsequent operations) γ = γ δB100
δ represents the change ratio of one operation. If the skip signal was
entered during the previous cutting:
δ = Parameter No. 305
When the skip signal was not entered during the previous cutting:
δ = Parameter No. 306
If the spindle speed is clamped to the lower limit, no spindle speed
change is made.
Explanations