Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 542)

Single-Pass Turning Cycles
Chapter 22
22-2
Important: Descriptions in this chapter are written assuming the control is
in the G18 plane and that plane has been defined as the ZX plane. If your
system has a different plane active, operation of these features is different.
Parameters are defined here assuming Z is the first axis in the plane, and X
is the second axis in the plane. If, for example, the XZ plane is the
currently active plane, descriptions in this document should be interpreted
accordingly (i.e., Z axis description applies for X axis and X axis
description applies to Z axis. See your system installer’s documentation
for details on the plane definitions on your system.
G20 calls either a straight or a taper cutting cycle. This cycle is a
single-pass cycle.
Use the G20 cycle to cut along the diameter of a workpiece (in this manual
that means cuts parallel to the Z axis). The G20 cycle basically consists of
the moves shown in Figure 22.1.
Figure 22.1
G20 Straight Cutting Cycle
Rapid feed
Cutting feed
4
1
2
3
Z
X
1. Rapid approach to the part
2. Cutting feed into the part
3. Cutting feed out of the part
4. Rapid return to the start point
22.1
Single-pass O.D. and I.D.
Roughing Cycle (G20)