Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 475)

Angled-Wheel Grinding
Chapter 14
14-7
Figure 14.4
Feedrate Clamp Reached on W Axis
X Axis
Feedrate
Z Axis Feedrate
W
Wheel Axis
Feedrate
The X axis feedrate is the vectored sum of the W and Z axis feedrates.
Note the physical W axis feedrate must always exceed the X axis
feedrate (except for wheel angles of 0 or 180 degrees where the W axis feedrate would
equal the programmed X axis feedrate).
+ or -- any additional Z Axis
move programmed in the
block.
If one of the axes that make up the X move reaches its maximum rapid
feedrate, that axis speed is clamped and the X axis speed is never reached.
The speed of the second axis that makes up the X axis move is also
adjusted so to reach endpoint simultaneously with the clamped axis. Keep
in mind that if a Z axis move is also programmed with an X axis move that
feedrate is also added (or subtracted depending on the direction of the
move) from the Z axis speed but this sum is not allowed to exceed the axis
rapid.
The maximum cutting feedrate for the virtual axis (X) is a function of the
angle of the wheel axis, the angle of the move, and the maximum cutting
feedrates for the wheel axis (W) and the axial axis (Z). The physical speed
of any given axis can exceed the cutting feedrate however, the wheel feed
relative to the part will not exceed the cutting feed.
The G16.3 command is modal and belongs to modal group 15.
Programming a G16.3 in a block cancels G16.4 mode.
The G16.3 command must be programmed in a block that contains no
motion. If any axis words are in a G16.3 block, the control will generate
an error.
Program using the X and Z axis words in this mode. In the G16.3 mode,
the control will no longer allow you to program W axis words. Instead the
virtual axis named X is activated. X axis moves are actually a combined
move on both the W and Z axes. Both linear and circular interpolation
can be programmed for the X and Z axis pair in this mode.