Fagor 8025 T CNC, Operating Manual

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36 8025/8030 CNC PROGRAMMING MANUAL
6.10. G33. THREADCUTTING
Longitudinal frontal and tapered threads can be cut using G33 function. To apply this
function it is necessary for the machine to have a rotary encoder in the spindle. G33 is
modal, i.e., once programmed it is maintained. It is cancelled by G00, G01, G02, G03,
M02, M30, EMERGENCY or RESET.
Longitudinal thread
It can be programmed by means of:
N4 G33 Z+/-4.3 K3.4 (mm)
Z+/-3.4 K2.4 (inches)
where:
N4 : Block number
G33 : Threadcutting code
Z+/-4.3 (Z+/-3.4) : Final coordinate of the thread along Z axis
K3.4 (K2.4) : Thread pitch along Z axis
The Z value will be absolute or incremental depending on whether G90 or G91 has been
programmed. If the function G33 is active, the F feedrate speed cannot be altered by
turning the FEEDRATE knob, whose value will be frozen at 100%.
Frontal thread (scroll)
It can programmed as follows:
N4 G33 X+/-4.3 I3.4 (mm)
X+/-3.4 I2.4 (inches)
N4 : Block number
G33 : Threadcutting code
X+/-4.3 (X+/-3.4) : Final coordinate of the thread along X axis
I3.4 (I2.4) : Thread pitch along X axis
The X value will be absolute or incremental depending on whether G90 or G91 has been
programmed.