Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 492)

Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-8
Figure 21.5
Results of TTRC Program Example
start
point
Cutting tool center path
X
Z
N1
N2
N3
N4
N5
N6
In certain instances, TTRC creates a non-programmed move called a
generated block. These blocks improve cycle time and corner-cutting
quality.
TTRC generates blocks for type A or B moves as follows:
Type of Move Type A Type B
Entry Move No block is generated Block is generated
Tool Path Block is generated Block is generated
Exit Move No block is generated Block is generated
Important: These blocks are created only if:
G41 is active and cutting an inside angle that is less than 90°
G42 is active and cutting an outside angle that is more than 270°
21.2
TTRC Generation Blocks
G39, G39.1