Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 651)

Drilling Cycles
Chapter 26
26-25
In the G84.3 left-hand solid-tapping cycle, the control moves the axes in
this manner:
1. The tool rapids to the tapping position above the hole location.
2. The threading tool then rapids to the R point.
3. The control either orients or stops the spindle.
If a Q-word was programmed: the control:
yes orients the spindle
no stops the spindle
4. Tap-in: The counterclockwise rotation of the spindle ramps up to the
programmed S spindle speed and linear motion of the Z axis moves
synchronously to reach the Z position.
5. Tap-out: The spindle and linear motion reverse to the clockwise
direction and retract to the R point.
The tap-out speed is determined by F
*
S unless you programmed D
(tap-out rpm), in which case tap-out speed is F
*
D.
At the R point, spindle rotation has ramped to zero.
6. With G98 active, the cutting tool then accelerates to the rapid feedrate
and retracts to the initial point level.
With G99 active, the cutting tool remains at R point; no movement
occurs.
In single-block mode, the control stops axis motion after phases 1, 2, 3,
and 6 of the cycle (Figure 27.L2).
The format for the G85 cycle is:
G85X__Z__R__F__L__;
Where : Is :
X specifies location of the hole.
Z defines the hole bottom.
R defines the R point level.
F
defines the cutting feedrate.
L
defines the number of times the drilling cycle is repeated.
(G85): Boring Cycle, No
Dwell/Feed Out