Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 98)

Manual/MDI Operation Modes
Chapter 4
4-6
The control may be equipped with an optional jog offset feature, activated
by a switch installed by the system installer. When this function is active,
all jog moves made are added as offsets to the current work coordinate
system.
Normally, jogging occurs in the manual mode. The system installer has the
option to enable a “Jog on the Fly” feature that will allow jogging in
automatic or MDI mode for the purpose of jogging an offset. To jog in
automatic or MDI mode both the “Jog on the Fly” and jog offset features
must be active. Normally, the system installer will enable both of these
features with the same switch. Refer to documentation provided by the
system installer for details. “Jog on the Fly” can be performed at any time
during automatic operation, even while blocks are being executed.
To use this feature, follow these directions:
1. Turn on the switch to activate the jog offset function. Refer to
documentation provided by the system installer.
2. Change to manual mode unless the control is equipped for the “Jog
on the Fly” feature which allows jogging in MDI and Automatic
modes. If equipped with “Jog on the Fly,” turn on the switch to
activate it. For details, refer to documentation prepared by the system
installer.
3. Jog the axis by using any of the available jog types, with the
exception of homing, as described on page 4-8. The control adds
the amount of the jog move as offsets to each jogged axis
immediately when the jog takes place.
Important: When the jog move is made, the axis position displays do not
change on the screen unless the currently active screen is the absolute
screen as described on page 8-6. This is because the value is being added
to the work coordinate system offset and the control does not recognize
any tool motion on the coordinate system.
The control stops tool motion during overtravel conditions. Overtravel
conditions can occur from 3 causes:
Hardware Overtravel ---- the axes reach a travel limit, usually set by a
limit switch or sensor mounted on the axis. Hardware overtravels are
always active.
Software Overtravel ---- commands cause the cutting tool to pass a
software travel limit. Software overtravels are active only after the axis
has been homed provided the feature has been activated in AMP by the
system installer.
4.1.6
Jog Offset
4.1.7
Resetting Overtravels