Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 464)

Tool Control Functions
Chapter 13
13-2
The control can store up to 32 wheel length offsets for each axis. Your
system installer configures the actual number of available offsets on your
system in AMP. Each offset can select a different control point on the
wheel. Typically, each time you dress a different profile into the wheel,
you need to activate different length offsets.
Program a T word to select and activate a wheel length offset. You can
program a T word in any block in a part program.
Important: When you activate the miscellaneous function lock feature, the
control ignores M, B, S, and T words in the part program with the
exception of M00, M01, M02, M30, M98, and M99. You can activate this
miscellaneous function lock feature through the front panel screen (as
described on page 2-11) or by an optional switch installed by your system
installer.
The format for a T word is as follows:
Trrll;
Where: Is:
rr the dresser/wheel radius and orientation offset number. The
radius/orientation offset number is the first two digits of the T word. See
chapter 3 for details on radius/orientation data.
ll the wheel length offset number. The wheel length offset number must be the
last two digits of the T word. See chapter 3 for information on wheel length
offset values.
An offset number selected as zero (for either length or radius/orientation)
selects an offset value of zero and effectively cancels wheel length offsets
and dresser/wheel radius compensation. Dresser/wheel radius
compensation is not canceled when a radius offset number of zero is
programmed (G41 or G42 remain active). In this case, the control uses a
radius value of zero. You must cancel dresser/wheel radius compensation
by programming a G40.
Important: T words are always right-justified. This means that
programming a two-digit T word only enters a wheel length offset value
and does not specify a radius/orientation offset number. Table 13.A gives
some example T words and the resulting offset numbers activated.
13.1.1
Selecting Wheel Length
Offsets (T Word)