Yaskawa YASNAC PC NC Programming Manual - Manual (Page 161)

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YASNAC PCNC Programming Manual Chapter 4: Enhanced Level Commands
(c) Mid-retract command (C-point level command)
In a high-speed deep-hole drilling cycle called by G73, it is possible to retract a cutting
tool to the R-point level after it has reached the specified level. The mid-retract command
allows single-block stop at the retracted level.
This feature makes discharging of chips possible during the execution of a cycle.
The C-point level is specified by an unsigned incremental value. The cutting tool retracts
to the R-point level after each drilling of distance C. This command is invalid if C-axis is
set as an optional axis. If C-axis is selected as an optional axis, designation of address C
calls up C-axis.
Note: For C and Q, unsigned incremental values should be specified.
Entry of a minus sign is disregarded.
FIGURE 4.1.1.6 Mid-retraction Command (C-point Level Command)