Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 637)

Turning Operations
Chapter 18
18-21
Figure 18.18
Results of Variable Lead Face Threading Example 18.7
Z
37.5
9.5
57.0
47.5mm
.1 thread/mm
(10mm pitch)
.526 thread/mm
(1.9 mm pitch)
X
.171 thread/mm
(5.833mm pitch)
Grinding
Wheel
12077-I
The lead changes continuously during the move. At any point during the
move, you can calculate the lead with this formula:
instantaneous lead = F + (K * number of revs since the start)
Figure 18.19
Instantaneous Lead
Revolutions
K * Revs
F
Lead
Distance
END OF CHAPTER