Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 69)

Chapter
3
3-1
Offset Tables and Setup
In this chapter we describe the basics for job setup. Major topics include:
Topic: On page:
Changing the active tool offset 3-14
Work coordinate system offset table 3-15
Backing up offset tables 3-19
Programmable zone table 3-21
Single--digit feedrate table 3-23
Use tool offsets to let the programmer always write a part program with
respect to the same point on the machine regardless of the tool being used.
Tool lengths are taken into account using tool length offsets as described in
chapter 20. The radius of the tool tip and tool orientation in the turret are
taken into account using TTRC as described in chapter 21. This section
describes entering these values that are called later when the corresponding
offset is activated.
Tool offsets are divided into two tables:
Tool Geometry Table - This table is typically used to enter tool data for
a brand new tool just being installed or replaced.
Tool Wear Table - This table is typically used to record slight changes
that occur to a tools shape during normal usage. Since the tools basic
orientation does not change, no orientation data may be entered into this
table.
When offset data is called in a part program, the control subtracts the value
called from the wear table from the value called from the tool geometry
data table. The result is used as the offset data for that tool. Typically
when a new tool is installed, the wear offset value is zero. As the tool gets
older, the wear value is increased.
3.0
Chapter Overview
3.1
Tool Offset Tables
{TOOL GEOMET} and
{TOOL WEAR}