Yaskawa YASNAC PC NC Programming Manual - Manual (Page 188)

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YASNAC PCNC Programming Manual Chapter 4: Enhanced Level Commands
FIGURE 4.1.4.2 Tapping Cycle with Variable Pitch Command
Operation (G 184 mode)
€ Positioning at the hole position specified by X, Y
ó Positioning at the R-point level
ì Starting the spindle in the forward direction; Z-axis feed by the distance specified by I at
the specified feedrate
ö Stopping the spindle
ú Starting the spindle in the reverse direction; Z-axis retraction to the R-point level at the
specified feedrate
÷ Stopping the spindle
ø Repeats steps É to Ü by increasing tapping feed distance by “I – (n – 1) J” from the previ-
ous feed distance until “Increased amount of feed distance £ K.
í Infeed to the Z-point level by taking the feed distance that satisfies “Increased amount of
feed distance < K” as value K.
û When the Z-point level is reached, the spindle stops.