Programming manual.
CNC 8070
10.
ELECTRONIC THREADING AND RIGID TAPPING.
Electronic threading with constant pitch (G33)
·180·
(REF: 1709)
Thread pitch.
• The pitch is defined by the letters "I", "J" or "K" depending on the active plane.
• When interpolating several axes in the electronic threading, the pitch is not defined on
the path, it is defined on one of the axes.
• If the pitch of the thread is not programmed, the CNC acts as follows.
1 If no G33 or G34 has been programmed earlier, the CNC will issue an error message.
2 If a G33 has been programmed earlier, the pitch will be the pitch of the last G33
programmed.
3 If there is no G33, but a G34 has been programmed earlier, the pitch will be the final pitch
of the last G34 programmed.
Spindle angular position.
Spindle angular position (within ±359.9999º) for the starting point of the thread. With this
parameter, it is possible to make multi-entry threads. Programming it is optional; if not
programmed, the function executes the thread at 0º (same as programming Q1=0).
Considerations about execution.
Interrupt execution ([STOP] key or PLC mark _FEEDHOL).
The behavior of the CNC when interrupting a threading ([STOP] key or PLC mark
_FEEDHOL) depends on function G233. See "10.4 Withdraw the axes after interrupting an
electronic threading (G233)." on page 191.
• If G233 is active, when interrupting the thread, the axes withdraw the distance
programmed in that function. If when interrupting the threading the pass is near the end,
the CNC ignores G233 and stops the axes at the end of the pass.
• If G233 is not active, when interrupting the threading the axes stop at the end of the pass.
Spindle home search.
If the spindle has not been homed (referenced), the first G33 will be done automatically when
using the master spindle. If the spindle is the master and it has not been homed, it will issue
a warning.
G17 G18 G19 Letters "I", "J" and "K" are associated with the first, second and third
axis of the channel respectively.
G20 Letters "I", "J" and "K" are associated with the abscissa, ordinate and
perpendicular axes of the defined plane.
Example:
Electronic threading on the Z axis and in different planes (configuration of XYZ axes in the
channel).
G17 (XY plane)
G33 Z40 K2
G18 (ZX plane)
G33 Z40 K2
G19 (YZ plane)
G33 Z40 K2
G20 Z1 Y2 X3
G33 Z40 I2
G20 Y1 Z2 X3
G33 Z40 J2
G20 Y1 Z3 X2
G33 Z40 K2
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