Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 485)

Chapter
21
21-1
Tool Tip Radius Compensation (TTRC)
Function
This chapter describes Tool Tip Radius Compensation function. Major
topics include:
Topic: On page:
Programming TTRC 21-4
Generation blocks 21-8
Tool paths (Type A) 21-10
Tool paths (Type B) 21-20
Tool path during TTRC 21-30
Special cases 21-35
Error detection 21-52
Generally, cutting tools used on lathes have a rounded cutting edge which
often results in a difference between the cutting tool tip position assumed
in writing a part program, and the actual cutting tool tip position. This
inevitably causes a difference between the programmed shape and the
actual shape cut on the workpiece in taper and arc cutting operations. See
Figure 21.1.
For reference, the term “tool tip radius compensation” has been shortened
to TTRC and is referred to as such in the following sections.
The TTRC functions allows you to use tools with different radii without
requiring a modification of the part program.
21.0
Chapter Overview