Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 487)

Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-3
outside ---- Refer to an angle between two intersecting programmed tool
paths outside if, in the direction of travel, the angle measured clockwise
from the second tool path into the first is greater than 180°. See
Figure 21.2. If one or both of the moves are circular, the angle is
measured from a line tangent to the tool path at their point of
intersection.
r ---- cutter radius
CR ---- cross-point between two programmed paths after you activate the
TTRC
Figure 21.2
Definition of Inside and Outside
workpiece
Inside angle (less than 180°)
Outside angle (greater than 180°)
workpiece
There are two types of cutter compensation available on the 9/Series
control:
type A (as described on page 21-10)
type B (as described on page 21-20)