Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 532)

Fixed Cycles
Chapter 25
25-12
Function
Use this parameter for lathe controls when cutting either the single pass or
multiple pass threading cycles. The G-codes for these cycles are:
G Code System Single Pass Multiple Pass
A G92 G76
B G78 G76
C G21 G78
This parameter determines the pullout angle “a” for the threading
chamfer feature.
If a value has been set for this and the “Pullout Distance, Chamfered
Thrd” parameters, and the PAL flag $FCPULL has been set true, then the
control automatically cuts a chamfer at the end of each threading pass
during the operation of the threading cycles. This also lets you abort a
threading pass and cut a chamfer out of the thread when the <CYCLE
STOP> button is pressed.
Refer to the lathe operation and programming manual for details on
threading chamfer.
For this parameter, enter in degrees the angle of the chamfer. The length of
the chamfer is determined by using the “Pullout Distance, Chamfered
Thread” parameter. See Figure 25.1 for examples of Pullout Distance and
Pullout Angle.
25.9.2
Pullout Angle, Chamfered
Thrd