Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 643)

Drilling Cycles
Chapter 26
26-17
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 counterclockwise 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 clockwise.
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
after steps 1, 2 and 6.
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 the operator activates a feedhold 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.
Use this cycle to cut left-handed threads.
The format for the G84.1 cycle is:
G84.1X__Z__R__P__F__L__;
Where : Is :
X specifies the location of the hole position in the selected plane.
Z defines the hole bottom.
R defines the R point level.
P defines the dwell period at hole bottom.
F defines the cutting feedrate and represents the thread lead along the drilling axis
(Z in this manual). It is mandatory when cutting any threads. The control
interprets the F-word as the number of threads per inch or millimeter.
L defines the number of times the drilling cycle is repeated.
See section 27.3 for a detailed description of these parameters.
(G84.1): Left-Hand Tapping
Cycle