G33/G33.1: Thread cutting

It is used for thread cutting and is typically required in lathe models. The F command specifies the thread profile, and the Q command specifies the thread entry angle. While this command is being executed, the axis movements are synchronized with the turret spindle angle. The part is approached from the same angle in each pass.

G33: Constant-Pitch threading with external encoder

G33.1: Constant-Pitch threading with rotary axis

X: X axis target coordinate

Y: Y axis target coordinate

Z: Z axis target coordinate

F: Thread pitch

Q: Thread initial angle

In the axis codes, the axis or axes specified as a command will move accordingly. For the thread cutting command to function, an encoder must be directly connected to the spindle, and the necessary settings must be configured by the machine manufacturer. The recommended resolution is 1024 pulses/rev. If a servo motor is connected to the spindle, thread cutting can be performed without an external encoder using the G33.1 code. Similarly, the required settings for this command must also be configured by the machine manufacturer.

Example:

G00 X4.5 Z2.   (RAPID MOVEMENT TO THE STARTING POINT)

G33 Z-24. F2.  (THREAD CUTTING COMMAND)

G0 X10.        (RAPID RETRACTION ON THE X AXIS)

G0 Z2.         (RAPID MOVEMENT TO THE STARTING POINT ON THE Z AXIS)