Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 74)

Chapter 3
Offset Tables and Setup
3-2
Figure 3.1
Wheel length Offsets
Wheel gauge point on spindle from which
wheel offsets are usually measured
(determined by your system
installer) Wheel length offsets simplify
programming and allow processing from
different points on the wheel without
changing the part program
X length
offset
Z length
offset These length offsets select this point as
the control point for programming
11982-I
Resolution of wheel radius and length offset data is determined by the
programming resolution selected for the axis in AMP. For example, an X
axis that can be programmed with 4 decimal place accuracy also allows 4
decimal place accuracy in the offset tables.
Figure 3.1 illustrates typical cylindrical grinder length offsets. Length
offsets for a surface grinder application can be more complex as additional
axes can be offset.
Wheel Length Offset Numbers
Call out wheel offset numbers in a program through use of the T word.
The last two digits of the T word specify an offset number for wheel
length. This number is independent of the dresser/wheel radius and
orientation offset number which is the first two digits of T word. The
control then accesses the values assigned to that offset number in the wheel
length offset table. Length offsets are activated as described in chapter 13.
You can store valid wheel lengths for each axis by using offset numbers
ranging from 01 to 32. You cannot use offset number “00” to store wheel
offset data but you can program “00” to cancel wheel length offsets. You
can call different offset numbers from the wheel geometry and wheel
radius table using the same T word.