Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 507
Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-23
There is no limit to the number of blocks that can follow the programming
of G41 or G42 before an entry move takes place. The entry move is
always the same regardless of the number of blocks that do not program
motion in the current plane for compensation.
Example 21.7
Sample Entry Move After Non-Motion Blocks
Assume current compensation plane is the ZX plane.
N01X0Z0;
N2G41;
This block commands compensation left.
N3M02;
This is not the entry block since no axis
motion takes place in the current plane.
N4...;
No axis motion in current plane.
N5...;
No axis motion in current plane.
N6...;
No axis motion in current plane.
”
”
”
”
”
”
N999X1Z1;
This is the entry move for the previously
programmed G41.
Your system installer selects in AMP the allowable number of non-motion
blocks that are allowed during TTRC before the entry move must be
re-initialized. See section 22.5.2.
For example, assume that your system installer has designated that only
two non-motion blocks can be performed. Then, if more than two blocks
during TTRC do not contain axis motion in the current plane, the entry
move is re-performed at the next block containing axis motion in the
current plane.
Example 21.8
Too Many Non-Motion Blocks During TTRC
Assume current plane to be the ZX plane and the system installer has
designated that only two non-motion blocks can be performed before
TTRC is re-initialized.
N1X0Z0;
N2G41X1Z1;
Entry move TTRC left.
N3...;
No axis motion in current plane.
N4...;
No axis motion in current plane.
N5X4Z-4;
New entry move TTRC left.