13.FUNCTIONS TO SIMPLIFY PROGRAMMING PROGRAMMING B-63324EN/03
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13.2.2 Left-handed Rigid Tapping Cycle (G84.3)
When the spindle motor is controlled as if it were a servo motor,
tapping cycles can be sped up.
The only difference from the rigid tapping cycle (G84.2) is the spindle
rotation direction during tapping.
After positioning along the X- and Y-axes, rapid traverse is performed
to point R.
Tapping is performed from point R to point Z. When tapping is
completed, the spindle is stopped and a dwell is performed. The
spindle is then rotated in the normal direction, the tool is retracted to
point R, then the spindle is stopped. Rapid traverse to initial level is
then performed for G98.
While tapping is being performed, the feedrate override and spindle
override are assumed to be 100%. However, the speed for extraction
(operation 5) can be overridden by up to 200% depending on the setting
at parameter 5883.
- Thread lead
In feed-per-minute mode, the thread lead is obtained from the
expression, feedrate × spindle speed.
In feed-per-revolution mode, the thread lead equals the feedrate.
G84.3 X_ Y_ Z_ R_ P_ F_ L_ S_ ;
X_ Y_: Hole position data
The distance from point R to the bottom of the hole and the position of the bottom of the hole
R_ : The distance from the initial level to point R level
P_ : Dwell time at the bottom of the hole and at point R when return is made.
F_ : Cutting feedrate
L_ : Number of repeats (Only for necessity of repeat)
Point R level
Spindle stop Spindle CW
Point R level
S_ : Spindle speed