Manual

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 locationof the holeposition in the selected plane.
Z defines the holebottom.
R defines the Rpoint level.
P defines the dwellperiod at holebottom.
F defines the cuttingfeedrate andrepresents thethread leadalong thedrilling axis
(Z in this manual). It is mandatorywhen cuttingany threads. The control
interprets theF-word asthe numberof threads perinch ormillimeter.
L defines the numberof times thedrilling cycleis repeated.
See section 27.3 for a detailed description of these parameters.
(G84.1): Left-Hand Tapping
Cycle