Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 314)

Introduction to Programming
Chapter 10
10-36
When programming an S word in a block that contains axis motion
commands, the PAL program has the option to temporarily suspend the
axis motion commands until the spindle reaches speed. The control can
search for and select the appropriate gear range to attain the programmed
spindle RPM. The operation of gear changing and how it is implemented
is PAL dependent. See your system installer’s documentation for details
on how a gear change operation is performed.
For details on programming spindle speeds, see page 12-34.
Important: When the miscellaneous function lock feature is activated, the
control ignores M, B, S, and T words in the part program with the
exception of M00, M01, M02, M30, M98, and M99. This feature is
activated as described on page 7-2.
You can override programmed spindle speeds with the <SPINDLE SPEED
OVERRIDE> switch on the MTB panel. This switch can be positioned in
5% increments within a range of 50 - 120%. For details, see your system
installer’s documentation.
Use the override disable M code (M49) to ignore any override set on the
MTB panel. When the override settings are ignored, the axis feedrate,
rapid feedrate, and the spindle speed values are all set to 100%. For more
information on spindle functions, see page 12-34.
Modern grinders typically require the selection of multiple control points
on the wheel for grinding different contours and dressing different profiles.
Use the wheel length offset feature to shift the control point to the various
cutting locations about the grinding wheel. Activate wheel length offsets
with a T word as described in chapter 13.
Also, use the T word to select an active dresser/wheel radius compensation
offset number. This offset compensates for the radius of wheel corners or
dresser tip and orientation relative to the part/wheel surface.
Dresser/wheel radius compensation is described in detail in chapter 15.
The control can store as many as 32 wheel length offsets and 33
radius/orientation offsets. The actual number of available offsets on your
system is configured in AMP by your system installer. Typically each time
a different profile is dressed into the wheel or a different part of the wheel
is used as the grinding surface, you need to activate different offsets.
The selection and activation of offsets is done by programming a T word.
A T word can be programmed in any block in a part program.
10.5.11
T Words
(Length, Radius, and
Orientation Offsets)