Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 76)

Chapter 3
Offset Tables and Setup
3-4
Figure 3.2 shows typical length offsets for a cylindrical grinder. Generally
grinders are configured such that axes move in the negative direction as
they move the wheel towards the workpiece (along -X axis) and towards
the chuck (along -Z axis). Assuming this applies to your system, enter a
positive Z offset value to offset the gauge point away from the part spindle.
Enter a positive X offset value to offset the gauge point away from the part
spindle center line. Different wheel control points are established by the
values entered in the length offset table.
Cylindrical grinders can have axes assigned in AMP as diameter axes.
This allows values to be entered into the length offset table for that axis as
either diameter or radius values. This manual assumes that you use radius
values. If you enter values as diameters, you must enter the wheel
diameter instead of the wheel radius for the axis configured as the diameter
axis. G07 and G08 (radius and diameter modes) have no affect on values
entered into the offset tables.
Enter your length offset data in the wheel geometry table as described on
page 3-11.
If you are entering offset values for an angled-wheel grinder you should
also read the angled-wheel tool offset section on page 14-16.
Radius offset values let the programmer write a part program without
having to calculate wheel positions relative to the radius of the grinding
wheel, grinding wheel corner, or edge of the diamond point dresser. This
section describes entering these radius values that are used for
dresser/wheel radius compensation as described in chapter 15.
The control stores wheel radius offsets in a table called the radius table.
This table stores the radius values under radius offset numbers. Call out a
radius offset number with a T word in the part program. The control
references this table and looks up the associated radius values. For details
on how and when the radius offset is activated, see chapter 15.
The first two digits of the T word specify an offset number for radius and
orientation. This number is independent of the wheel length offset number
which is the last two digits of T word. Length offsets are activated as
described in chapter 13.
The control supports 3 dresser/wheel radius compensation schemes:
Dresser radius
Corner radius
Entire wheel radius
3.2
Dresser/Wheel Radius
Offsets
{RADIUS TABLE}