Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 75)

Chapter
3
3-1
Offset Tables and Setup
In this chapter we describe the basics of job setup. Major topics include
how to:
use the offset table
set and display offset data
set and display work coordinate systems
set and display communication parameters
The offset tables are broken in to two major tables: the tool geometry
offset table and the wear offset table. Use the tool geometry offset table to
enter measured values that compensate for differences in tool mounting
and differences in tool dimensions. Use the wear offset table to enter
measured values that compensate for the amount of wear on a tool under
normal use. “Wear” means a non-reversible tool dimensional change.
This data can be entered into the offset tables:
Tool length offset data (TOOL GEOMETRY and TOOL WEAR.)
Cutter radius data (TOOL GEOMETRY and TOOL WEAR)
Parameters for the resolution of the offset data are determined by the
system installer in AMP. For more AMP information see your:
9/Series CNC AMP Reference Manual
Offline Development System (ODS) Software User Manual
Any setting smaller than the minimum unit set for axis motion is not
acceptable as offset data. The minimum value available to the system
installer is 0.00001 mm (0.000001 inch) with a maximum value of
99999999 (8 digits).
The D--word in a program will call values from the offset tables
corresponding to the tools diameter. An H--word in a program will call
values from the offset tables for tool length. When the H-- or D--word is
programmed the control pulls data from both the tool the geometry table
and the tool wear table. The value from the tool wear table is subtracted
from the value from the tool geometry table. The result is used by the
control as tool length offset or cutter compensation data.
For details on using tool offsets see chapter 20. For information on cutter
compensation see chapter 21.
3.0
Chapter Overview
3.1
Tool Offset Table {TOOL
GEOMET} and {TOOL
WEAR}