2. FUNCTION TO SIMPLIFY
(For the Power Mate i–D/D2)
When the spindle motor is controlled in rigid mode as if it were a servo
motor, tapping cycles can be sped up.
G74 X_ Z_ R_ P_ F_ ;
X_ : 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
Point R level
After positioning along the X–axis, rapid traverse is performed to point
Tapping is performed from point R to point Z. When tapping is
completed, a dwell is performed and the spindle is stopped. 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%.
Specify M29 S***** before a tapping command.
In feed–per–minute mode, the thread lead is obtained from the
spindle speed. In feed–per–revolution mode, the
thread lead equals the feedrate.
If a tool length offset (G43, G44, or G49) is specified in the canned cycle,
the offset is applied at the time of positioning to point R.
Tapping Cycle (G74)