Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 116)

Manual/MDI Operation Modes
Chapter 4
4-12
Figure 4.5
Manual Machine Home
To execute the manual return to machine home position:
1. Select HOME under <JOG SELECT> .
2. Place the control in manual mode (see page 4-1).
3. Determine the direction that each axis must travel to reach the home
limit switch. See documentation prepared by your system installer on
the location of the home limit switch on your specific machine.
4. Press the <AXIS/DIRECTION> button for the axis and direction to
home. You can select more than one axis at one time. The axis
selected moves at the feedrate under
<SPEED/MULTIPLY> .
Important: If you choose a wrong direction for an axis, it continues
to travel in the selected direction until it contacts a hard limit and an
overtravel occurs (see chapter 11). Your system installer has the
option to enable some buttons or switches (typically cycle stop)
through the PAL program to abort a jog operation or prevent the user
from homing the axis in the wrong direction. See your system
installer’s documentation for details.
At this point, the control:
moves the axis until it trips its home limit switch. Then the axis
decelerates to a stop
reverses the axis direction and moves off the home limit switch at a
feedrate specified in AMP
records the distance to the nearest encoder marker or null position
moves in a direction specified in AMP an amount equal to the home
calibration value, specified in AMP, plus the distance from the encoder
marker or null position
This locates the machine home position. When the axis reaches this
position, the control resets the position registers to a machine coordinate
value specified in AMP. This establishes the zero point of the machine
coordinate system.
Important: During the machine home operation, softlimits and
programmable zones are not active. The control cancels all active
coordinates offsets.