Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 619
Thread Cutting
Chapter 25
25-19
Figure 25.13
G21 Taper Thread Cutting Parameters
Z
X Abs.
X Inc.
F
Z
Inc
.
Z
Abs.
I
X
When this cycle is executed:
1.
The cutting tool rapids to the depth programmed with the X-word
added to the I value.
2.
The thread cutting pass is made to the position programmed with the
X- and Z-words using a feedrate that generates the required lead
programmed with the F- or E-word. As the tool moves along this
threading pass, the taper distance programmed with the I parameter is
interpolated along the X axis.
Important: If the Thread Chamfering feature was enabled before the cycle
began execution, the control performs a chamfer before reaching the
programmed Z position. The chamfer angle and length of are set in AMP.
3.
The cutting tool is retracted away from the part at a rapid feedrate to
the X axis position prior to the G21 block.