Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 645)

Drilling Cycles
Chapter 26
26-19
CAUTION: The programmer or operator must set the direction
of spindle rotation for tap-in. The control forces the proper
spindle direction for the tap-out, but uses the programmed
spindle direction for the tap-in.
1. The tool rapids to the initial point level above the hole location.
2. The threading tool then rapids to the R point level, slows to the
programmed cutting feedrate and begins the tapping operation.
3. During the tapping operation, the control infeeds the threading tool to
the depth and at the feedrate programmed in the tapping cycle.
4. If a value was programmed for the P parameter, the threading tool
dwells after it reaches the bottom of the hole, and after the spindle has
been commanded to reverse.
The spindle or live tool reverses to the clockwise direction.
5. The threading tool retracts at the cutting feedrate to the R point.
6. If a value was programmed for the P parameter, the threading tool
dwells after it reaches the R point. Dwells may be ignored if the
system installer has chosen to do so in AMP.
The spindle or live tool direction is reversed to counterclockwise.
7. With G98 active, the cutting tool then accelerates to the rapid feedrate
and retracts to the initial point level.
When the single block function is active, the control stops axis motion and
awaits “cycle start” after steps 1, 2 and 7.
If the operator activates a feedhold during steps 3, 4 or 5, axis motion
stops after step 7. Axis motion also stops during steps 1, 2 and 7.
However, if feedhold is activated during step 7, axis motion stops
immediately.
Important: Your system installer can enable a tap retract feature for this
cycle through PAL. Tap retract enables you to retract the tapping tool and
resume the cycle, or completely abort the tapping operation. Refer to your
system installers documentation for details.