Fagor 8025 T CNC, Operating Manual

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8025/8030 CNC PROGRAMMING MANUAL 37
Tapered thread
It can be programmed as follows:
N4 G33 X+/-4.3 Z+/-4.3 I3.4 K3.4 (mm)
X+/-3.4 Z+/-3.4 I2.4 K2.4 (inches)
N4 : Block number
G33 : Threadcutting code
X+/-4.3 (X+/-3.4) : Final coordinate of the thread along X axis
Z+/-4.3 (Z+/-3.4) : Final coordinate of the thread along Z axis
I3.4 (I2.4) : Thread pitch along X axis
K3.4 (K2.4) : Thread pitch along Z axis
The X and Z values will be absolute or incremental depending on whether G90 or G91 has
been programmed.
Only one pitch value (I,K) need be programmed. The CNC will calculate the other one.
Thus:
N4 G33 X+/-4.3 Z+/-4.3 I3.4 (mm)
X+/-3.4 Z+/-3.4 I2.4 (inches)
or,
N4 G33 X+/-4.3 Z+/-4.3 K3.4 (mm)
X+/-3.4 Z+/-3.4 K2.4 (inches)
Can be programmed.
Nevertheless, both pitch values (I and K) can also be entered to force the CNC to cut the
tapered thread with a pitch different from the one the CNC would have calculated.
Atention:
The following error will normally produce incorrect pitches at the
starting and ending points of the threadcut. The threading length should
therefore be longer than required to avoid defective parts.