Yaskawa YASNAC PC NC Programming Manual - Manual (Page 193)

4 - 56
YASNAC PCNC Programming Manual Chapter 4: Enhanced Level Commands
1. If a C command is specified, the following operation is executed when the cut level
reaches the C-point level.
• The spindle stops and then starts rotating in the reverse direction; Z-axis retracts to the
R-point level at the specified feedrate.
• The spindle stops.
• The spindle starts rotating in the forward direction; Z-axis is fed to “C + I + (n – 1) J”
level at the specified feedrate.
2. The E command is valid for the retraction operation from the C-point level to the R-point
level and from the Z-point level to the R-point level. It is not valid for the Z-axis retrac-
tion by “d”.
3. The tapping operation is executed in the fixed pitch cycle if J = 0, or there is no J com-
mand.
If K = 0, or there is no K command, alarm 0162 “LACK OF ADDRESS” occurs.
(3) Supplements to the Deep-hole Solid Tapping Function
• If the G184/G174 command is specified in the G94 mode, the solid tapping is exe-
cuted in the G84/G74 mode using the addresses of X, Y, Z, F, S, R, and P.
• In the G184/G174 mode, feed override and spindle override are fixed at 100%. Note
that rapid traverse override is valid.
• During the execution of a tapping cycle, single-block stop is not executed and only the
cycle is suspended at the R-point level. Concerning the feed-hold stop, the points
where the cycle execution is suspended differ depending on the selected type of tap-
ping cycle.
Type A
(R-point return type)
Feed-hold stop is not executed during tapping.
If the FEED HOLD switch is pressed during the execution
of a tapping cycle, the operation stops after the completion
of chamfering. (The same position as the single-block stop
position.)
Type B
(pecking cycle type)
If the feed hold switch is pressed during tapping, Z-axis
retracts to the R-point level instead of retraction by “
δ
”. If
the feed hold switch is pressed during the retraction by “
δ
”,
Z-axis retracts to the R-point level after the completion of
the next feed.
After the operation is suspended due to feed hold, the
remaining tapping cycle is executed by restart operation.