14. FUNCTIONS TO SIMPLIFY
When the spindle motor is controlled in rigid mode as if it were a servo
motor, tapping cycles can be sped up.
G74 (G98) G74 (G99)
G74 X_ Y_ Z_ R_ P_ F_ K_ ;
X_ Y_: Hole position data
Z_ : 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
K_ : Number of repeats (Only for necessity of repeat)
Point R level
Point R level
Point R Point R
G84.3 X_ Y_ Z_ R_ P_ F_ L_ ; (FS15 format)
L_ : Number of repeats (Only for necessity of repeat)
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.
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 bit 4 (DOV) of parameter 5200 and
Rigid mode can be specified using any of the following methods:
Specify M29 S***** before a tapping command.
⋅ Specify M29 S***** in a block which contains a tapping command.
⋅ Specify G84 for rigid tapping. (parameter G84 No. 5200#0 set to1).
D Rigid mode