Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 615)

Thread Cutting
Chapter 25
25-15
Figure 25.11
Results of Variable Lead Face Threading Example
37.5
Z
37.5
9.5
57.0
47.5mm
.171 mm/rev
Z
57.0
.1 mm/rev
X
.171 mm/rev
.526 mm/rev