FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
B–62754EN/01
198
Controlling the spindle motor in the same way as a servo motor in rigid
mode enables high–speed tapping.
G84 or G88 (G98 mode) G84 or G88 (G99 mode)
G84 X(U)_ C(H)_ Z(W)_ R_ P_ F_ M_ K_ ;
or
G88 Z(W)_ C(H)_ X(U)_ R_ P_ F_ M_ K_ ;
X_ C_ or Z_ C_ : Hole position data
Z_ or X_ : The distance from point R to the bottom of the hole
R_ : The distance from the initial level to point R level
P_ : Dwell time at the bottom of a hole
F_ : Cutting feedrate
K_ : Number of repeats (When it is needed.)
M_ : M code for C–axis clamp (when it is needed.)
P P
Point R level
Point Z
Spindle CW
Point R Point R
Spindle stop
Spindle CCW
Spindle CCW
Spindle stop
Spindle stop
Point Z
Spindle stop
Spindle stop
Initial level
Operation5
Operation4
Operation3
Operation1
Operation2
Operation6
Spindle
stop
Spindle CW
P
P
Once positioning for the X–axis (G84) or Z–axis (G88) has been
completed, the spindle is moved, by rapid traverse, to point R. Tapping
is performed from point R to point Z, after which the spindle stops and
observes a dwell time. Then, the spindle starts reverse rotation, retracts
to point R, stops rotating, then moves to the initial level by rapid traverse.
During tapping, the feedrate override and spindle override are assumed
to be 100%. For retraction (operation 5), however, a fixed override of up
to 200% can be applied by setting parameter No. 5211 (RGOVR) and bit
4 (DOV) of parameter No. 5200.
Rigid mode can be specified by applying any of the following methods:
D Specifying M29S***** before a tapping block
D Specifying M29S***** within a tapping block
D Handling G84 or G88 as a G code for rigid tapping (Set bit 0 (G84) of
parameter No. 5200 to 1.)
14.8.1
Front Face Rigid
Tapping Cycle (G84) /
Side Face Rigid
Tapping Cycle (G88)
Format
Explanations
D Rigid mode

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