Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 477)

Angled-Wheel Grinding
Chapter 14
14-9
Two step angled-wheel grinding mode (G16.4) positions the X and Z axes
separately. The control will calculate how much W axis motion must
occur to reach the programmed X and Z endpoint. Z and W axis moves
are positioned to their respective endpoints in two independent moves.
The Z axis move is performed at the feedrate programmed for that block
times any feedrate override. The W axis feedrate is modified so that the
feedrate of the X axis motion generated by the W move (feedrate of the
wheel towards or away from the parts centerline) is equal to the
programmed feedrate times any feedrate override. This means that
feedrate of the W axis is dependant on the wheel axis angle. The feedrate
of the W axis move will always be greater than or equal to the
programmed feedrate (not taking into account any feedrate override that is
currently active).
The system installer determines in PAL which of the two step moves take
place first. The system default is as follows:
X axis direction is programmed away
from the part spindle centerline:
X axis direction is programmed
towards the part spindle centerline:
STEP 1 all W (wheel axis) motion takes place all axis motion generated from the block
takes place except W axis motion (Z
axis and any other axes programmed)
STEP 2 all other axis motion generated from the
block takes place (Z axis and any other axes
programmed) all W (wheel axis) motion takes place
The G16.4 command is modal and belongs to modal group 15.
Programming a G16.4 in a block cancels G16.3 mode.
The G16.4 command must be programmed in a block that contains no
motion. If any axis words are in a G16.4 block, the control will generate
an error.
Program using the X and Z axis words in this mode. Once the G16.4 mode
is entered, the control will no longer allow the programming of 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.
Upon entry into one of the angled wheel modes the control cancels all
active offsets. Offsets are not canceled when you change between G16.3
and G16.4 mode as long as angled wheel mode is not canceled with a G15
between modes.
14.3.2
Two Step Angled-Wheel
Grinding Mode (G16.4)