Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 102)

Manual/MDI Operation Modes
Chapter 4
4-10
Figure 4.4
Manual Machine Home
Machine home
AXIS/DIRECTION
Cutting tool
+X +4 --X
+Y TRVRS --Y
+Z --4 --Z
JOG SELECT
INCR CONT
HAND 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. Refer to your system installer on the location of the
home limit switch on a 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 the wrong direction for an axis, it will continue to
travel in the selected direction until it contacts a hard limit and an overtravel
will occur. See chapter 12. Your system installer has the option to enable
some button or switch (typically Cycle Stop) through the PAL program to
abort a jog operation or prevent the user from homing the axis in the wrong
direction. Refer to your system installer’s documentation for details.
The axis homes when :
1. The axis moves until it trips its home limit switch, then the axis
decelerates to a stop.
2. The axis then reverses direction and moves off the home limit switch
at a feedrate specified in AMP.
3. The controller records the distance to the nearest encoder marker or
null position.
4. The control then 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.