Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 513)

Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-29
Example 21.10
Exit Move Defined By An I, K Vector But Limited To Tool Radius
Assume T1 radius is 3.
N10 Z10.G41T1;
N11 X10.Z2.I3K-10.G40;
Figure 21.23
Results of Example 21.10
Intercept line
Compensated path using I, K vector
Compensated path if no I, K in G40 block
N11
N10
Compensated path
Programmed path
I, K
r
r
r
If the vector defined by I and/or K is parallel to the programmed tool path,
the resulting exit move is offset in the opposite direction of the I, K vector
by one tool radius.
Figure 21.24
Exit Move When I, K Vector is Parallel to Programmed Tool Path.
Intercept line
I, K
Programmed path
Compensated path
Compensated path using I, K vector
Compensated path if no I, K in G40 block
r
r
r
Important: If one I and/or K value is programmed without the second one,
the value of the second I- and/or K-word defaults to 0.