Programming manual
CNC 8070
TOOL PATH CONTROL
Electronic threading with constant pitch (G33)
6.
(SOFT V02.0X)
113
6.7 Electronic threading with constant pitch (G33)
When doing an electronic threading, the CNC does NOT interpolate
the movement of the axes with the spindle. Although this type of
threading are often carried out along an axis, the CNC allows doing
it by interpolating more than one axis at time.
Programming
An electronic threading is programmed with G33 followed by the
coordinates of the end point of the thread and the thread pitch.
Coordinates of the end point
It may defined in cartesian or polar coordinates both absolute and
incremental.
Pass definition
When one of the planes G17, G18 or G19 is active, the letters "I", "J"
and "K" will be associated with the X, Y and Z axes respectively.
The threading feedrate depends on the programmed spindle speed
and thread pitch (Feedrate = Spindle speed x Pitch).
Considerations
The electronic threading is carried out at 100% of the feedrate "F" and
spindle speed "S", and these values cannot be modified from the
CNC's operator panel or via PLC.
For electronic threading, the machine must have a rotary encoder
installed on the spindle.
i
To make the following thread in a single pass:
Position : X30 Y30 Z0
Depth : 30mm
Pitch : 1.5mm
...
S100 M03
G01 G90 X30 Y30 Z0
G33 Z-30 K1.5
M19 S0 (Spindle orientation)
G91 X3 (Tool withdrawal)
G90 Z10 (Withdrawal. Exit the hole)
...
The machining feedrate will be: 100x1.5 = 150mm/min.
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